TW201109741A - Light diffusing plate for point-light sources and direct-lighting backlight device using point-light-source - Google Patents

Abstract

This invention provides a light diffusing plate for using in a direct-lighting backlight device using point-light sources. It is capable of, without using multiple optical films, achieving excellent luminance, luminance uniformity (in frontal and diagonal view fields) and color unevenness characteristics with the desired thickness of backlight and reduced number of point-light sources. More specifically, this invention provides a light diffusing plate, which is used for point-light sources and has a plurality of convex portions formed on its surface. Each convex portion has a substantially triangular-pyramid shape with a triangular bottom. The slope angle (<theta>) of each side of the triangular-pyramid shape with respect to the bottom, and the material refraction index (A) of the convex portions satisfy the following two formulae (1) and (2), where formula (1): <theta> = -40A DEG + 115.2 DEG, and formula (2): <theta> = 25A DEG + 22.25 DEG.

Description

201109741 VI. Description of the Invention: [Technical Field] The present invention relates to a light diffusing plate suitable for a combination of backlights having a somewhat light source, and a direct type point light source backlight device including the same. [Prior Art] - Generally speaking, there are two methods called side-light type backlights and direct-type backlights. However, for large-scale display devices, they are more expensive and can achieve high brightness. Straight down backlight. As a direct type backlight, 'the front is usually designed on the basis of a linear light source such as a cold cathode tube, and a surface light is emitted using a diffusion plate and an optical film.

However, in recent years, in terms of environmental problems, life of light sources, power saving, and improvement of image quality, it is necessary to use LEDs (light emitting diodes) as light sources instead of cold cathode tubes. However, since the cold cathode tube is a line light source and the LED is a point light source, there is a problem that the unevenness of the unevenness becomes large, and the diffusion plate and the optical film require a technique of converting the point light source into a surface light source. As an LED light source, it is generally more common to use the Lambertian LED (Lambertian to price this (10)) LED which is the cheapest and has a strong light intensity of straight illuminating, and how to convert the light source which is directed toward the LED straight into a surface. The light source is a big problem. On the other hand, in recent years, there has been a strong demand for a liquid crystal display to be thinner and less expensive, and as a backlight, a technique of reducing a light source, reducing an optical film, and diffusing light from a light source to a diffusion plate is required. 148960.doc 201109741 Previously, as a light diffusion technique for a direct-type point light source, there has been proposed an image formation position adjustment method in which four dot shapes are formed with respect to a convex quadrilateral having the smallest area and the shortest circumference from the plurality of point light sources. Each of the point light sources of the light source and the light exit surface of the light diffusing plate can be observed in a specific region of the light exit surface. Further, as the shape of the light-diffusing sheet, a concave quadrangular pyramid shape having a different inclination angle has been proposed (for example, see Patent Document 1). In the same manner, in order to improve the light utilization efficiency, it is proposed to arrange the concave quadrangular pyramids in a diagonal shape on the light-emitting surface side of the light-diffusing sheet (see, for example, Patent Document 2). Further, as a method of reducing the amount of light of the LED light source, it is proposed to form a plurality of ridges having a plurality of turns with a corner shape on the exit surface side of the light diffusing plate (see, for example, Patent Document 3) . PRIOR ART DOCUMENT PATENT DOCUMENT Patent Document Patent Document 1: International Publication No. 07/114158, Patent Document 2: U.S. Patent No. 733,492, PCT Patent Publication No. JP-A No. 10-274947. However, in the case of using the light diffusing plate having the inverted quadrangular pyramid shape on the side of the exit surface described in the patent document, the luminance unevenness is reduced, and the effect is small, especially when viewed from the oblique direction. The brightness of the situation is more than the sentence, the problem. In the case of using the light diffusing plate of the above shape, in order to improve the brightness, it is necessary to increase the number of point light sources or the optical film, and the backlight is thickened. Further, the patent document describes that the surface of the light diffusing plate has a convex-concave tapered shape, but the triangular pyramid shape having a specific slope angle and the refractive index described in the claim of the present application is not described as being emitted to the light diffusing plate. The face side is shaped, and the brightness and brightness uniformity (front and oblique view) of the direct type LED light source backlight are dramatically improved. In addition, as in the patent document i, the light diffusing plate having a concave quadrangular pyramid shape on the side of the exit surface described in Patent Document 2 has a small uniformity in brightness and unevenness in color unevenness in the front and oblique directions. The problem. In order to improve the brightness uniformity of the point light source, it is necessary to increase the number of light sources or to use a plurality of optical films including the film, so that there is a problem that the cost becomes high. &amp; Further, in Patent Document 3, it is proposed to form a plurality of ridges having a thickness of 1 _ including a small number of 稜鏡 of the 丙烯-夂 秘 秘 之 隅稜鏡 但 但 但 但 但 但 但 但 但 但 但 但 但 但Uneven, no adequate improvement or improvement. Further, in Patent Document 3, it is described that it is preferable to use a pyramidal shape mirror such as a quadrangular pyramid or a hexagonal cone for imparting a corner shape to the exit surface side of the light diffusing plate, but it is not recorded by The triangular pyramid shape having the characteristic slope angle and the refractive index described in the item (4) is shaped on the exit surface side of the light diffusion plate to improve the brightness and brightness uniformity of the direct type LED light source backlight ( Front and oblique view) and uneven color. As described above, in the above prior art, it is preferable to exhibit excellent brightness, brightness uniformity (front and oblique viewing), and color unevenness characteristics under the desired backlight thickness, and it is necessary to configure a plurality of point light sources or use them in combination. An optical film, etc. changed 148960.doc 201109741 good. The present invention has been made in view of the above problems, and an object of the invention is to provide a point light source having a desired backlight thickness and a small number of backlights in a direct-type point light source backlight using a point light source, even if a plurality of optical films are not used in combination. At the same time, a light diffusing plate excellent in shell degree, brightness uniformity (front and oblique viewing), and color unevenness characteristics, and a direct type backlight using the light diffusing plate are realized. In order to solve the above problems, the inventors of the present invention have conducted intensive studies to find that the angle of inclination of the convex portion is the same in a light diffusing plate having a plurality of convex portions having a substantially triangular pyramid shape on the light emitting surface side. When the refractive index of the material forming the convex portion satisfies a specific relationship, brightness, color unevenness, and brightness uniformity, particularly squint brightness uniformity, are significantly improved when the light diffusing plate is disposed directly above the point light source, thereby completing the present invention. Further, it has been found that when such a light diffusing plate is combined with a point light source to produce a direct type backlight device, color unevenness characteristics, brightness and brightness uniformity (front and squint) are remarkably improved, and a large degree unpredictable in the prior art is realized. The present invention has been accomplished by reducing the number of light sources, thinning the thickness of the backlight, and reducing the optical film. That is, the present invention is as follows. [1] A light diffusing plate for a point light source, wherein a light diffusing plate having a plurality of convex portions formed on a surface thereof is formed, and a bottom surface of the convex portion is a triangular triangular pyramid shape, 148960.doc 201109741 a side of the substantially triangular pyramid shape The inclination angle θ with respect to the bottom surface and the refractive index 材料 of the material forming the convex portion satisfy the following formulas (丨) and (2)·(1) · · · -40Α°+115.2° (2) · · · 25Α °+22.25° ° [2] The light diffusing plate for a point source according to the above [1], wherein the inclination angle 1 and the refractive index Α satisfy the following formulas (3) and (4): (3) · · · Θ2 -40Αο + 116.2. (4) θ $25Αο + 20·25ο » [3] The light diffusing plate for a point light source according to [1] or [2] above, wherein the inclination angle 1 is Θ/55. . [4] The light-diffusing sheet for a point light source according to any one of the above [1] to [3], which does not exhibit a return reflection characteristic with respect to visible light incident from a side opposite to a surface side of the convex portion forming surface. Further, the following conditions (丨) are satisfied, and the condition (1): using a spectrophotometer, from the surface opposite to the convex portion, is incident at an incident angle of 450 to 75 at an incident angle of 7 degrees with respect to a perpendicular to the horizontal plane of the light diffusion plate. The average reflectance r at the time of nm light is 45% or more. [5] The light diffusing plate for a point light source according to any one of the above [1] to [4], which satisfies the following formula (5): (5) · · * g/(b+c+d)^ 0.30 (in the formula (7), 'b, c, and d respectively indicate the apex of the top triangle by the following I point, j point, and convex 148960-doc 201109741 vertices (in the case where the convex portion is in the shape of a triangular frustum) 3 When the plane of the point cuts the convex portion, the angle θ formed by the tangent plane of one side surface of the convex portion and the bottom surface is projected to the portion of the following formulas (1') and (2'). The length of the projection line segment of the horizontal plane, the length of the projection line segment projecting to the horizontal plane from the portion c on the bottom side of the more convex portion, and the length of the projection line segment projecting the portion D located on the more top side to the horizontal plane. Γ) . . . θ'^-40Α° + 11 5.2° (21) · · . θ'^ 25Α°+22.25° I point: the apex of the convex part (when the convex part is in the shape of a triangular frustum, The center of gravity of the top quadrangle is projected perpendicularly to the point of the bottom triangle. "Accounting from the above 1 point, the nearest edge to the j point in the side of the bottom triangle The intersection of the perpendicular line and the side when the vertical line is formed. In the formula (5), g is a cut when the convex portion is cut by a plane perpendicular to the bottom triangle and is cut by a plane of the following 、, J, and a point. The one-side portion of the section from the center to the point of the defect, the 'in the tangent to the side of the convex portion is located at an angle 较 between the tangent and the bottom surface, satisfying (1,) and (2,) Part: The length of the projection line segment projected to the horizontal plane by the portion on the top side. Therefore, when there are a plurality of cut surfaces satisfying the above conditions, the cut surface having the largest value of g is used. The apex of the part (in the case where the convex part is in the shape of a triangular frustum, the top. P, the center of gravity of the angle) is vertically projected to the point of the bottom triangle, and the bottom of the bottom corner of the triangle is closest to the bottom of the projection point. Vertex l4S960.doc 201109741 The midpoint of the connected line segment. r point: from the above I' point, the intersection of the perpendicular line and the edge when the vertical line is drawn from the edge closest to the r point in the side of the bottom triangle. [6] Optical expansion for point source as in [5] above The light-diffusing sheet for a point light source according to any one of the above-mentioned items [1] to [6], which comprises at least (a) a lens layer and a slab (b) a diffusion layer, wherein the (a) lens layer and the (b) diffusion layer are selected from the group consisting of a same layer, a continuous layer, and a separation layer, wherein the convex portion is formed in the (a) lens [8] The light diffusing plate for a point source according to [7] above, wherein the (8) diffusion layer contains a transparent resin and a diffusing agent, and the diffusivity is 8 to 4%. [9] The spot light (four) light diffusing plate according to [7] or [8] above, comprising (4) a lens layer and (b) a diffusion layer, wherein a sum of thicknesses of the (4) lens layer and the (b) diffusion layer is 〇5 ~3〇_. [10] A direct-type point light source backlight device, comprising: a plurality of point light sources; wherein the light diffusing plate of any one of (1) to [9] is disposed above the point light source, and a point light source is opposite to the opposite side of the surface side of the 148960.doc 201109741 side, a plurality of convex portions having a substantially triangular pyramid-shaped bottom surface are formed on the surface; and a diffusing reflection sheet is disposed at the above point Below the light source. [11] The direct-type point light source backlight device according to [10] above, wherein the point light source has a light peak angle of -25 to 25. LED light source. [12] The direct-type point light source backlight device of [10] or [11], wherein the diffusive reflection sheet has a diffuse reflectance of 9% or more. [13] The direct type backlight device according to any one of the above [10], wherein the light-emitting surface of the light-diffusing sheet further comprises at least two optical films having a light collecting function. [14] The direct type backlight device according to any one of the above [10] to [13] wherein, in the case where the average pitch of the point light sources is p, and the distance from the point light source to the light diffusion plate is set to H When 卩/1^ is in the range of 1.5 to 2.5. [15] A direct type backlight device comprising a plurality of point light sources, and the light diffusing plate according to any one of the above [1] to [9], wherein the plurality of point light sources are periodically arranged in a lattice shape. The plurality of convex portions of the light diffusing plate are periodically arranged such that the bottom triangular 148960.doc 201109741 of the adjacent convex portions is parallel to each other, and the plurality of point light sources and the light diffusing plate are Each of the light diffusing plates is convex. Any one of the sides of the bottom surface of the crucible is laminated parallel or perpendicular to the diagonal of the square of the lattice constituting the lattice arrangement of the point light source. [16] A direct type backlight device comprising a plurality of point light sources, and the light diffusing plate according to any one of the above [1] to [9], wherein the plurality of point light sources are periodically arranged in a lattice shape. The bottom surface of the plurality of convex portions is a substantially triangular pyramid shape of an isosceles triangle, and the plurality of convex portions of the light diffusion plate are periodically arranged such that bottom edges of the equal waist portions of the adjacent convex portions are parallel to each other Arranging, wherein the plurality of point light sources and the light diffusing plate are parallel to a diagonal of a quadrangular shape of a bottom surface of each of the convex portions of the light diffusing plate and a square of a lattice of the point light source Layered vertically or vertically. [17] A direct type backlight device comprising a plurality of point light sources, and the light diffusing plate according to any one of the above [1] to [9], wherein the plurality of point light sources are periodically arranged in a lattice shape. The bottom surface of the plurality of convex portions is a substantially triangular pyramid shape of an equilateral triangle, and the plurality of convex portions are periodically and parallel to each other in a manner that the sides of the adjacent convex portions are equilateral triangles 148960.doc • 11 · 201109741 Arranging, wherein the plurality of point light sources and the light diffusing plate are parallel to a diagonal of a square of a bottom surface of each of the convex portions of the light diffusing plate and a diagonal of a square of a lattice of the dot light source Laminated in a vertical manner. Effect of the Invention When the light diffusing plate of the present invention is used right, when combined with a point light source, good enthalpy, color unevenness, and brightness uniformity (front and oblique) are exhibited, so that the result can be realized for the backlight. The reduction of the light source and the optical film, and the thinning of the backlight. [Embodiment] Hereinafter, a mode for carrying out the invention (hereinafter referred to as "this embodiment") will be described in detail. The present invention is not limited to the following description, and various modifications can be made without departing from the spirit and scope of the invention. [Light diffusing plate for point light source] The light diffusing plate of the present embodiment is a light diffusing plate in which a plurality of convex portions are formed on the surface thereof. The bottom surface of the convex portion is a triangular triangular pyramid shape. The light diffusing plate is an inclination angle θ of the side surface of the substantially triangular pyramid shape with respect to the bottom surface (hereinafter referred to as "the inclination angle 0") and a refractive index 材料 of the material forming the convex portion (hereinafter, sometimes only The refractive index Α) is a light diffusing plate for a point light source that satisfies the following formulas (1) and (2). (1) · · · θ^-40A°+11 5.2° 148960.doc -12- 201109741 (2) · · . 25A0+22_250 Figure 4 shows the refractive index Α as the horizontal axis and the inclination angle θ as the vertical axis. Picture. In Fig. 4, the light diffusing plate of the present embodiment satisfies the formula 0 = 25 eight. +22.25. The lower side is Θ=-40Α〇 + 11 5.2. The condition in the area above the upper side. The inclination angle Θ of the substantially triangular pyramid shape of the convex portion of the surface of the light diffusing plate and the refractive index Α satisfy the relationship between the above formulas (1) and (7), and the brightness of the point light source using the light diffusing plate is uneven in brightness and color. Characteristics, front brightness uniformity, and squint brightness uniformity are significantly improved. As the surface shape of the light diffusing plate, the target performance of the present invention cannot be expressed even if a convex triangular pyramid, a convex pyramid shape, and a concave polygonal pyramid including a triangular pyramid are used. Further, in the case where the surface shape of the light-diffusing sheet is a convex-shaped substantially triangular pyramid shape, the color unevenness characteristics, the brightness uniformity of the front surface and the oblique view are remarkably deteriorated when the above (1) and (2) are not satisfied. The above-mentioned tilt angle 0 and refractive index A satisfy the above-mentioned equations (3) and (4), the ij exemption degree, the color unevenness characteristic, the front luminance uniformity, and the squint brightness uniformity. Further improvement is preferred. (3) · · · -40Ao+l 16.2. (4) · · · Hacker 25 eight. +20.25. Further, when the inclination angle Θ is 55·5 or more, it is preferable to be a diffusing plate which is excellent in brightness, color unevenness, front straightness, uniformity, and slant brightness uniformity. , ', : by using a laser microscope or SEM (scanning electron

Pe, scanning electron microscope) (electron microscopy) to observe the diffusion 148960.doc •13·201109741 The shape of the surface of the plate is obtained. The refractive index A can be obtained by forming a film having a smooth surface with 埶A τ after a convex portion forming a convex portion, and then obtaining a smooth surface by 埶 according to JIS K7U2. Further, after &amp;± using the Abbe-folding convex portion, the ##月$ may be obtained by breaking the above-mentioned cut portion by the shell method. Brother (Becke also 'the rust in the material that forms the material of the convex portion of the light diffusing plate is determined by the transparent person (for example, transparent resin) to determine the macro-p-light diffusing agent, etc., refractive index,疋 即便 疋 疋 疋 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊 羊Go to & 丨 ^ head only to make the convex part of the use of Abbe pumping &lt;) 朕, with the above civilized refractometer, 敎 臈Α. The body is out of the hand, and the refractive index is obtained. The shape of the convex part of the #撼大撼板 of this embodiment refers to the triangle of the bottom surface, and the top of the three-pointed 裉 裉 裉 士 士 或 或The crucible smaller than the bottom surface also includes a so-called triangular frustum as shown in FIG. When the side of the convex portion of the diffuser plate can be a point where the plane portion is a point, the vertex can be as a curved surface, as shown in the top view of FIG. 2, the line can be sharpened as well as the ridge line of the triangular cone. Further, the shape of the convex portion of the light diffusing plate of the present embodiment, that is, the shape of the substantially triangular pyramid is preferably a vertex (or Ξ.0, ^^^ 贞. The line connecting the center of the corner and the center of the corner of the bottom surface (the central axis) is perpendicular to the plane, that is, it is not a slope. The light diffusion plate of the present embodiment, as described above, the above-mentioned inclination angle θ The angle formed by the side surface of the convex portion and the bottom surface. Further, when one of the side surfaces of the convex portion includes a curved surface, and when the side surface of the convex portion includes a flat surface, the angle formed by the flat surface and the bottom surface is inclined. The angle θ. When the side of the convex portion is reciprocated (5) 匕 3 plural planes, the angle between the plane with the largest area and the bottom surface is the inclination angle 1. Also, when the sides of the convex portion are all curved surfaces The inclination angle 9 is the plane of the side and the bottom surface In the case where the substantially triangular pyramid shape is an oblique triangular pyramid, the inclination angle 0 is the largest angle among the angles formed by the three side surfaces of the convex portion and the bottom surface. Preferably, the diffusing plate has a convex portion having the same shape having a substantially triangular pyramid shape periodically formed on the surface thereof. Further, in terms of color unevenness characteristics, brightness, and brightness, it is preferably the present embodiment. The shape and arrangement of the convex portion of the light diffusing plate of the form are full (5) 〇 (5). * g/(b+c+d)^ 〇.3 〇 In the above formula (5), the buxins respectively indicate that In the cut surface that occurs when the convex portion is cut by the plane of the three points of the m, j point and the apex of the convex portion (the center of gravity of the top triangular portion when the convex portion is in the shape of a triangular frustum), The angle θ formed by the tangent plane of the convex portion and the bottom surface satisfies 10 of the length (5) of the projection line segment projected to the horizontal plane by the portion of the following formula (η and (2·); The part c of the bottom side is projected to the horizontal plane i48960.doc •15· 201109741 The length of the projected line segment (C in Figure 5); and will be located The length of the projected line segment projected to the horizontal plane by the portion D on the top side of B (10 in the figure (!')(2,) • · · * θ'^ -40Α° + 115.2° θ'^ 25Α° + 22.25 ° I point: the vertex of the convex part (the center of gravity of the top triangle when the convex part is in the shape of a triangular frustum) is vertically projected to the point of the bottom triangle. The heart is from the above m, in the side of the triangle forming the bottom surface. The point where the perpendicular line intersects the edge when the vertical line is drawn from the point closest to the point of the illusion, and the point on the bottom side of the convex portion of the B is included in the portion between the convex portion and the adjacent convex portion. The part of the distance Lxl/2, the apex of the top side convex part of d (in the case of the triangular frustum shape, the temple is the top triangle: in Fig. 5, the straight line segment is exemplified as the part B, but partially to satisfy the above formula The part of (1') can also be a curve. For example, 'in the case of the refractive index of the material forming the convex portion of the bulk plate, the portion B may be (4) to 62. In the range of continuous rl description (5)_, for g machining ^ «Λ, will be perpendicular to the plane of the bottom triangle and through the following !, point, ~ plane (dashed line in Figure 23 (A)) cut the above The cut of the convex material appears in Fig. 23(B). ', take' point: the vertex of the convex part (in the case of (4) is the shape of a triangular frustum: 'the center of gravity of the top triangle') is vertically projected to the point of the bottom triangle: the closest to the projection point of the vertex of the bottom triangle The bottom triangle is 148960.doc •16- 201109741 The point in the line connecting the vertices. From the point I' above, the intersection of the perpendicular line and the side with respect to the side of the side of the bottom triangle which is closest to the I point. = Fig. 23(B) shows the center from the cut surface The portion of the tangent to the side of the convex portion is located at an angle θ between the tangent line and the bottom surface, and satisfies the above (1,) and (2, Part of the top part of the projection I + m π The length of the projection line segment of the projection from the Jing ^ to the water surface is set to g. Wherein, in the case where there are a plurality of cut surfaces of the above conditions, 'g The cut surface having the largest value is more preferably 0.01 Sg / (b + c + d) S 0, 20, and further preferably 4 〇〇 1 gg / (in terms of improving the degree of shelling and brightness uniformity). b+c+d)g 〇1〇 Further, in terms of color unevenness characteristics, brightness, and brightness uniformity, it is preferable that the shape and arrangement of the convex portion of the light diffusing plate of the present embodiment satisfy the following formula (6) and (7). (6) · · *0^ c/(b+c+d)^ 0.20 (7) . · · 〇^ d/(b+c+d) ^ 0.40 to further increase the brightness And brightness uniformity More preferably, it is 0.01^c/(b+c+d)$0.13' and further preferably 〇〇1$c/(b+c+d)g〇%. Furthermore, the above b, c, d, g By using a laser microscope or an SEM (Electronic Display Mirror) to observe the cross-sectional shape of the surface of the diffusion plate, the general triangular shape of the convex portion can be seen from the viewpoints of brightness uniformity, moiré, and manufacturing. The above b, c, d two = 5 ~ 200 μηι preferably 'better than 1 ~ 150 μηι, and further preferably i5 ~ i2 〇 μηι 〇 148960.doc 17 · 201109741 again, the light diffuser convex The height of the substantially triangular pyramid shape of the portion (the distance from the bottom surface to the uppermost portion) is preferably 1 〇 to 4 〇〇 μηι. - The convex portion of the light diffusion plate of the present embodiment is preferably 10 7 π π J The shape of the complex reflection characteristic is not exhibited. That is, if the substantially triangular pyramid shape is a shape that does not exhibit the complex reflection characteristic, the proportion of light that is emitted from the point source and returned to the point source again is reduced, and the point source can be suppressed from absorbing light. As an index of the reversion reflection characteristic, the side of the light diffusing plate opposite to the side on which the convex portion is formed may be used (the light incident surface) side. 'The average reflectance r when incident on a light with a wavelength of 45 〇 to 750 nm is inclined at an incident angle of 7 degrees with respect to the perpendicular to the horizontal plane of the light diffusing plate. Here, the average reflectance R is 45 〇. The average value of the reflectance is obtained for each wavelength of 1 nm in the wavelength range of 75 〇 nm. If the average reflectance R is 45% or more, it can be said that the reversion reflection component is less, and the light absorption of the point source is less. The light diffusing plate is a light diffusing plate which is excellent in color unevenness characteristics, brightness, and brightness uniformity. The average reflectance R is more preferably 50% or more, and still more preferably (10) or more. When the substantially triangular pyramid shape of the convex portion is, for example, a convex substantially triangular pyramid having a triangular bottom surface and a shape in which the inclination angle θ of the side surface of the triangular pyramid is 57 degrees with respect to the bottom surface, the light does not return to the light. The light spot has no reversion reflectivity and therefore has a higher average reflectance. On the other hand, in the case of the above-mentioned convex portion, when the shape of the pyramidal shape has, for example, a corner shape (the above-described inclination _5 degrees) and has a reflexive reflectance, the light returns to the light entrance point of the light. Therefore, the average reflectance R is less than 148960.doc •18·201109741 45%. Therefore, the shape of the substantially triangular pyramid is preferably a substantially triangular pyramid shape in which the inclination angle 0 is 55 &lt; Further, from the viewpoint of improving color unevenness characteristics, brightness, and brightness uniformity, it is preferable to appropriately diffuse light incident on the light diffusing plate. Therefore, the upper limit of the average reflectance R is preferably 7% or less, more preferably 67% or less. When the light-diffusing sheet and the light source of the present embodiment are used in combination, the convex portion having a substantially triangular pyramid shape is disposed on the light-emitting surface side of the two surfaces of the light-diffusing sheet to have luminance and color unevenness characteristics. Brightness uniformity (front and oblique view) is especially excellent for backlights. Furthermore, in the present specification, in the case of being used in combination with a light source, the surface close to the light source (ie, the side opposite to the light source) is defined as the light incident surface, and the surface away from the light source (the opposite side of the light source) ) is defined as the illuminating surface. The convex portion having a substantially quadrangular pyramid shape is provided on the surface of the light diffusing plate in plural. The shapes of the plurality of convex portions may be the same or different. Further, the aspect of the arrangement of the plurality of convex portions is not limited. For example, from the viewpoint of brightness uniformity and productivity, it is preferable that the plurality of convex portions are arranged adjacent to each other such that the opposite sides of the triangular faces of the adjacent convex portions are parallel to each other. Further, the shape of the bottom face of the convex portion is not limited. For example, as shown in Fig. 6, when the inner corners of the triangular faces of the convex portions are respectively α, β, and γ, it is preferably 148960.doc • 19-201109741 α-β1 from the viewpoint of brightness uniformity. Ιβ-γΐ and 丨γ-α| are respectively 20. Hereinafter, it is further preferably 5. the following. The shape of the triangle on the bottom of the convex part is particularly good. More preferably 10. In the following, it is preferable that the shape is an isosceles triangle, a positive triangle, and the like, and the convex portion of the substantially triangular pyramid shape provided on the surface of the light diffusion plate is formed at a level above the light diffusion plate, and is formed. It is 70 areas of 95 faces. /. The above region ' is more preferably formed to have an area of 8 Å, more preferably 90% by area or more, and still more preferably 5% or more. From the viewpoints of brightness and brightness of front and squint, the preferred mirror layer and (b) diffused light diffusing sheet of the present embodiment comprise at least (4) a layer. Layer The above (4) lens layer is formed with a layer of the above-described convex triangular pyramid shape. The above (7) diffusion layer may be formed of a plurality of layers (4) and (b) which may be formed of a single layer or a layer of a transparent resin and a diffusing agent and diffuse light. As shown in Fig. 7, the above (a) layer and (b) layer may be the same layer, may be a joint, a layer, or may be a separate layer. The same layer, and &gt; Jiang t, is formed on the surface of the (b) diffusion layer to form the above-mentioned substantially digonal pyramid: that is, the layer of the (4) layer is formed in the (nine) layer. — The continuous layer of the stomach s consists of a layer in which the heart (a) lens layer and (b) the diffusion layer are dense and integrated. The mirror layer and (b) the diffusion layer are individually thin. The so-called separation layer refers to a structure in which (4) 148960.doc -20·201109741 sheets are present, and two sheets are physically overlapped. The separation layer may be disposed from the side close to the light source by a combination of the (a) layer, the (b) layer, the (b) layer, and the (a) layer, or may be further in the (a) layer and the (3) layer. Other sheets are placed between the layers. The material of the convex portion (the (a) lens layer in the case of the configuration shown in Fig. 7) of the light-diffusing sheet of the present embodiment is a refractive index satisfying the above formulas (1) and (2). A is not limited, and for example, a resin having a high light transmittance is preferably used. For example, polyethylene terephthalate, polybutylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and the like may be mentioned. Copolymer; polyolefin resin such as polypropylene, polydecylpentene, alicyclic polyolefin; polystyrene, styrene-acrylonitrile copolymer, styrene-mercapto-acrylic acid copolymer, decyl methacrylate a styrene resin such as a styrene copolymer or an α-mercapto styrene copolymer; an acrylic resin such as polymethyl methacrylate or polyethyl acrylate; a methacrylate resin or a polycarbonate resin. The material constituting the convex portion of the light diffusing plate of the present embodiment (in the case of the configuration shown in Fig. 7 (a) lens layer) is a material having a refractive index A satisfying the above formulas (1) and (2). There is no limitation on the refractive index A, and the refractive index is preferably 1.43 or more, more preferably 〖49 or more, from the viewpoints of brightness, color unevenness characteristics, front side uniformity uniformity, and squint brightness uniformity. Further preferably, it is 1_53 or more, and particularly preferably ι·55 or more.

The upper limit of the refractive index A does not particularly exist, and the refractive index A 148960.doc • 21 · 201109741 is preferably 1.71 or less from the viewpoints of brightness, color unevenness characteristics, frontal redundancy uniformity, and squint brightness uniformity. Good for 1.65 or less. Further, the diffusivity s of the light diffusing plate of the present embodiment is preferably 2% or more, and more preferably 5 °/. The above is further preferably 1% or more. Further, as described below, the inclination angle θ is 55. In the case of the case, the return reflection is reduced, so the diffusivity S is preferably 5. /. More preferably, it is 1% or more. The upper limit of the diffusivity s of the light-diffusing sheet of the present embodiment is preferably 4% or less, more preferably 30% or less. When the diffusivity S of the light-diffusing sheet is in the above range, it is a light-diffusing sheet excellent in brightness, brightness uniformity (front and squint), and color unevenness characteristics. Further, regarding the diffusion rate s, when the (a) layer and the (b) layer of the light diffusion plate are the same layer, when the (a) layer and the (b) layer are continuous layers, and (a) When the layer and the layer (b) are separated layers, the surface is smoothed by a hot press or the like in a state in which the layers (a) and (b) are overlapped, and a variable angle photometer (for example, the enamel color industry) is used. The GC5000L manufactured by the company measures the brightness of the transmitted light when the light is incident at a light incident angle of 0 degrees in the transmission mode, and the above-described diffusion rate S can be obtained by the following formula. In the case where the light-diffusing sheet is formed of only the layer (a), the surface is smoothed by a hot press or the like, and then the measurement is performed in the same manner as described above, and the diffusion rate s can be obtained by the following formula. . Diffusion rate S=100x (L (20 degrees) + l (70 degrees)) / (L (5 degrees) χ 2) Here, L (5 degrees) is the brightness (four) of the transmitted light that is emitted toward the angle of 5 degrees. L (2〇) is the brightness of the transmitted light (4)/m2) which is emitted toward the angle of 2G degrees, and L (7〇) is the brightness (cd/m2) of the transmitted light which is emitted toward the angle of 70 degrees. 148960. Doc 22-201109741 When the light-diffusing sheet of the present embodiment has the configuration of FIG. 7, the material for forming the (b) diffusion layer is not particularly limited, and examples thereof include a resin composition containing a (transparent) resin and a diffusing agent. As the material of the (b) diffusion layer constituting the light-diffusing sheet, it is preferable to disperse an optimum amount of a resin having a refractive index component having a refractive index different from that of the resin in an optimum particle diameter in the transparent resin. The specific example of the resin is a polyester resin such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate or polyethylene naphthalate. And other copolymers; polyolefin resins such as polypropylene, polymethylpentene, alicyclic polyolefin; polystyrene, stupid ethylene acrylonitrile a styrene resin such as a styrene-methacrylic acid copolymer, a methyl methacrylate-styrene copolymer or an α-methylstyrene copolymer; an acrylic resin such as polymethyl methacrylate or polyethyl acrylate; Resin; thiol acrylate resin, polycarbonate resin, etc. Examples of the light diffusing agent include acrylic resin crosslinked fine particles, styrene resin crosslinked fine particles, polyfluorene-based resin crosslinked fine particles, and MS (曱) Methyl methacrylate-styrene copolymer) is a crosslinked microparticle, a fluororesin microparticle, a glass microparticle, a cerium oxide microparticle, calcium carbonate, barium sulfate, titanium oxide, aluminum oxide, talc, mica, etc., which may be used alone or The shape of the light diffusing agent may be a spherical shape, an elliptical shape, an indefinite shape, a needle shape, a plate shape, a hollow shape, a column shape, a tapered shape, or the like. As the average particle diameter of the light diffusing agent, the brightness is used. From the viewpoint of uniformity and ease of manufacture, it is preferably 1 to 2 〇 μιη, and most preferably 2 to 1 〇 μηι. The above average particle diameter 148960.doc -23-201109741 can be determined by a particle size distribution meter. Further, in the case where the light diffusing plate of the present embodiment has the configuration of Fig. 7, when the layers (a) and (b) are the same layer, the brightness and brightness uniformity (front and squint) are considered. In addition, the refractive index of the material constituting the (b) diffusion layer is such that the refractive index A′ must satisfy the above (1) and (2), but when the (4) layer and the (9) layer are continuous layers and separation layers, the (b) diffusion layer is formed. The refractive index of the material does not need to satisfy the above formulas (1), (2), and in terms of brightness uniformity and ease of manufacture, the refractive index difference between the resin constituting the layer and the light diffusing agent is preferably 0.05. ～1, more preferably 〇1〇~0.16. For example, as the light diffusing agent which is preferable for the polystyrene resin, acrylic crosslinked fine particles or polyfluorene-based crosslinked fine particles can be cited. Further, the amount of the light diffusing agent added is preferably 0.02 to 2% by mass, more preferably 0.02 to 2% by mass, based on the total of the material (for example, the resin composition) constituting the (b) diffusion layer, from the viewpoint of brightness uniformity and ease of production. For 仏 (seven) ~ 丨 quality. Further, the total light transmittance of the light-diffusing sheet of the present embodiment is preferably 83% or more, more preferably 85% or more. The upper limit of the total light transmittance Tb is preferably 95% or less. When the total light transmittance Tb is in the above range, it is a light-diffusing sheet excellent in brightness, brightness, uniformity (front and squint), and color unevenness characteristics. Further, regarding the total light transmittance D, in the case where the (4) layer and the (b) layer of the light diffusing plate are the same layer, when the (4) layer and the (8) layer are continuous layers, and in the case of the layer) In the case of the separation layer, the surface can be smoothed by a hot dust machine or the like in the state of the (4) layer and the (b) layer. 2 148960.doc -24·201109741 The above-mentioned pressed product is measured in accordance with JIS Κ71 〇5. In the case where the light diffusing plate is formed of only the layer (a), the surface of the layer (a) is smoothed by a hot press or the like, and then measured in the same manner as described above. In the light diffusing plate of the present embodiment, the convex portion has an inclination angle θ of 55. The substantially triangular pyramid shape or the like exhibits a shape of a reversion reflection characteristic, and a refraction reflection component can be reduced by adding a diffusion agent to the material forming the convex portion or providing a diffusion layer containing a diffusing agent. Specifically, the inclination angle 0 of the convex portion is 55. In the light-diffusing sheet having a substantially triangular pyramid shape, the light-diffusing sheet having an average reflectance rule of 45% or more can be obtained by reducing the complex reflection component by making the diffusivity 3 5% or more. Further, the upper limit of the diffusivity S of the light diffusing plate is preferably 4% by weight or less, more preferably 30% or less. When the diffusivity S is in the above range, the light diffusing plate is excellent in brightness, brightness uniformity (front and squint), and color unevenness characteristics. The complex reflection component may be reduced by adding a diffusing agent to the light diffusing plate in such a manner that the average tilt angle U of the light incident surface of the light diffusing plate is 1 degree or more, preferably 5 degrees or more. Alternatively, the total light transmittance Τ from the convex shape surface of the light diffusing plate to light is controlled to be 75 to 95%, more preferably 80 to 92%. (Thickness of Light-Diffusing Plate) The light-diffusing sheet of the present embodiment is preferably 0.5 to 3. 〇 mm, more preferably 〇 8 to 25 148960, from the viewpoint of rigidity and optical characteristics (brightness and brightness uniformity). Doc -25·201109741 mm 'and further preferably 1.0 to 2.0 mm. Further, when the light diffusing plate of the present embodiment has the configuration shown in Fig. 7, when the (a) layer and the (b) layer of the light diffusing plate are separated layers, the layers (a) and (b) are overlapped. The total thickness of the layer is taken as the thickness of the light diffusing plate. (Other Layers) The light diffusing plate of the present embodiment can be formed as a laminated structure in which other layers are laminated as needed, in addition to the layers (a) and (b). The layer configuration can be appropriately selected depending on the purpose and purpose. In the example of the layer configuration, in addition to the lens layer (a) layer and the diffusion layer (b) layer, if the layer containing the other resin composition or compound is the X layer 'γ layer or the Z layer, for example, the IX layer can be cited. / (a) (b) Two layers of the same layer, or X layer / (a) layer / (b) layer, (a) layer / (b) layer / X layer, (a) layer / X layer / ( b) 3 layers of layers, X layer / (a) layer / (b) layer / X layer, X layer / (a) layer / (b) layer / γ layer, χ layer / (a) layer / Y layer / (b) layer of 4 layers, and then χ layer / γ layer / (a) / (b) / Y layer, 乂 layer, (a) layer / Y layer / (b) layer / X layer, X layer / (Phantom layer / γ layer / layer) layer / z layer of 5 layers and so on. Further, a plurality of layers of the same resin composition may be continuously laminated. In addition, it is also possible to laminate five or more layers. However, in consideration of the easiness of manufacture, the vehicle owner preferably forms a light diffusing plate of five or less layers. (Additive) Various additives may be blended in the light-diffusing sheet of the present embodiment. As such an additive, for example, an organic or inorganic dye or pigment, a matting agent, a heat stabilizer, a flame retardant, an antistatic agent, an antifoaming agent, a 148960.doc -26-201109741 colorant, an antioxidant, Ultraviolet absorber, crystal nucleating agent, whitening agent, trapping agent for impurities, thickener, surface conditioning material, and the like. (Other configuration examples of the light diffusing plate) The light diffusing plate t of the present invention is preferably formed with the above-described substantially triangular pyramid shape from the viewpoint of brightness uniformity and friction with the indicating pin in An Mengguang. The surface of the convex portion is the surface on the opposite side, that is, the surface of the disk and the surface of the human light surface (the surface on the light source side) in the preferred aspect of use. Λ Specifically, in terms of the game room; 5&amp; and the uniformity of the child's degree, the average tilt angle of the lighter surface is called ~3. . More preferably 3 to 25. , = 5~20. . The average tilt angle U of the instrument into the light surface is less than 1. For example, if the inclination angle of P on the light-emitting surface side is 55 degrees, the light diffusing plate exhibits a return-reflecting characteristic, and the light emitted from the point light source returns to the point light source, and the brightness of the backlight is lowered. Also, if the average tilt angle exceeds 3 inches. However, there is a tendency that the uniformity of brightness is deteriorated. The above average tilt (four) can be obtained by observing the cross section of the diffuser plate by a laser microscope, and is '100 μηηι Width in the longitudinal direction and the short side direction of the diffuser plate; The average tilt angle of the width of 1 μπι (the tilt angle with respect to the horizontal plane of the light diffusing plate) is calculated, and the average value of the longitudinal direction and the average value of the short side direction are calculated to calculate the average. In the case where the light diffusing plate of the present embodiment has the configuration shown in Fig. 7, when the (4) layer and the _ are separated layers, it is preferable that the (4) layer and the (8) layer have the average tilt angle of the light incident side. For the above range. 148960.doc -27-201109741 [Manufacturing Method of Light-Diffusing Plate] The light-diffusing sheet of the present embodiment can be produced by forming a convex portion by a known method and using a known method for the material constituting each layer of the light-diffusing sheet. For example, a resin molding composition containing a resin having a high light transmittance is extruded from a metal port in a molten state, and a melt molding method is used to form a resin formed into a desired shape; and the resin composition is dissolved in the resin composition. a solution casting method for extruding from a metal port in a solvent, forming a roll formed into a desired shape; and extruding a molten resin on a solid film obtained by surface forming by a solution casting method a lamination method or a dry lamination method of laminated solid films; a stamper formed into a desired shape, &amp; a method of hot press forming a sheet extruded from a metal port in a molten state; and further, processing A method of performing injection molding of a mold having a desired shape. Among these, the melt forming method is an optimum forming method from the viewpoint of productivity and environmental suitability. [Direct-type point light source backlight device] The backlight device of the present embodiment has a point light source chassis in which a plurality of point light sources (LEDs) are disposed, a diffusive reflection sheet (diffusion reflector), and the present embodiment, as shown in FIG. The form of light diffusing plate is configured in sequence. In the direct-type point light source backlight device of the present embodiment, the light diffusing plate is disposed above the point light source, and the bottom surface is formed in a triangular shape on a side opposite to a surface side facing the point light source. A convex portion of a generally triangular pyramid shape. In the direct-type point light source backlight device of the present embodiment, as the diffusive reflective sheet (diffusing reflective sheet in Fig. 8), white having a diffuse reflectance of 148960.doc • 28 - 201109741 9 〇 / 〇 or more is preferably used. Resin thin #, more preferably 95% or more of white resin sheet. The diffuse reflectance can be obtained by using a spectrophotometer such as a spectrophotometer uv_22〇〇 manufactured by Shimadzu Corporation, and the incident wavelength of the sheet is 45 〇 nm to 7 〇〇 nm at an incident angle 〇°. The reflectance at the time of light was measured every 10 nm, and the average reflectance was calculated. In the direct-type point light source backlight device of the present embodiment, the point light source is preferably an LED light source having a light peak angle of -25° to 25° from the viewpoint of brightness and brightness uniformity. As the point light source, for example, a led light source having a Lambertian light distribution can be cited. The light diffusing plate of this embodiment has a light peak angle of more than 25. The point source of the wide-angle light distribution provides excellent brightness uniformity. The light diffusing plate of the present embodiment is for _25. ~25. The incident light has a remarkable excellent diffuse reflection property, and thus has an optical peak angle of more than 25. Compared with the point light source of the wide-angle light distribution, the light peak angle of the light having a strong intensity directly above the light source is _25. ~25. The combination of point light sources achieves particularly excellent brightness and brightness uniformity. Further, the diffusive reflective sheet (diffusing reflector) diffuses and reflects the light diffused and reflected by the light diffusing plate toward the light diffusing plate side, thereby making the light diffusing plate and the diffusing reflective sheet (diffusing reflecting sheet) The light is uniformized, and as the light, the brightness uniformity of the front side and the squint can be maintained, and the color unevenness characteristic is excellent. Also, the light peak angle I48960.doc •29-201109741 is _25 compared to a point source having a wide-angle light distribution. A light source of ~25° (for example, an LED light source) has a high conversion efficiency to light energy and a high luminance of an average current. Therefore, if the light diffusion plate of the present embodiment is used for such a point light source, it can be maintained. In the state of higher brightness, brightness uniformity and color unevenness characteristics are improved. As described above, the light diffusing plate of the present embodiment has the diffuse reflection performance that diffuses and reflects the light from the point light source and the light collecting performance between the light sources at a wide range of angles, which cannot be simultaneously achieved by the previous light diffusing plate. By setting the peak angle of the point source, especially the light, to _25. ~25. The light of the straight illuminating light is combined with the diffusing reflective sheet to achieve a direct-type point source backlight with excellent brightness. In the direct type point light source # weaving of this embodiment, the angle of the light peak used is _25 to 25. When the LED light source is used as a point light source, as shown in FIG. 8 'When the average distance between the uppermost portion of the point light source and the light diffusing plate is h, and the average distance between adjacent point light sources is p, it is preferable. 2.5. ~ Here, the average distance H between the uppermost part of the point source and the light diffusing plate is measured by the distance between the upper part of the source and the light diffusing plate. The unit is mm) and its average value is taken. Moreover, the average distance p of the adjacent point light sources (the unit is the surface area of the screen area of the backlight (in units of _) divided by the number of point sources, and the screen area of the moonlight," It refers to the area of the screen (the part of the image) that is displayed by using the backlight. The form of the image is straight down to the north of the road. #m 直^^ The point source backlight device, the brightness, the front 148960. Doc -30-201109741 and it is preferable that the light-emitting surface side of the light-diffusing sheet of the present embodiment further includes an optical film having a condensing property from the viewpoint of brightness uniformity. The optical film refers to a film having a function of elevating light incident on the film toward the film in the upward direction of the film, and is preferably a variable angle photometer when the sheet is incident on a monochromatic light of 550 nm at an incident angle of 60 degrees (for example). The film having a main peak angle of 50 degrees or less of the light distribution measured by GC5000L manufactured by Sakamoto Denshoku Industries Co., Ltd. is preferably a film having a main peak angle of 35 to 45 degrees. For example, a commercially available rib Lenses, diffusion sheets, lens sheets, etc. especially More preferably, the following arrangement pattern is used: the main peak angle of the light distribution measured by the variable angle photometer when two pieces of 55 〇 11111 monochromatic light are incident at an incident angle of 60 degrees on the side of the light source surface of the light diffusing plate are a pattern of an optical film of 35 degrees to 45 degrees; or a light distribution measured by a variable angle photometer when the cymbal is incident on the opposite side of the light diffusing plate at an incident angle of 60 degrees. An optical film having a main peak angle of 35 to 45 degrees, and further having an arrangement pattern of the cymbal thereon. The prior light diffusion plate is, for example, a light diffusion plate having a concave quadrangular pyramid shape on the surface, for Ρ/Η = At least 9 or more optical films having condensing properties are required to achieve brightness and brightness uniformity under the conditions of 1.9. However, when the light diffusing plate of the present embodiment is used, the optical film can be similar in two pieces. The performance of the optical film is greatly reduced, and the economical effect is remarkably increased. In the direct type backlight device of the present embodiment, the light source angle is preferably -25 to 25 as a preferred point light source. High light intensity 148960.doc 31 201109741 Point light source (for example, LED light source with Lambertian light distribution), or LED light source with a wide-angle light distribution with a light peak angle of more than 25. The laser light source of the wide-angle light distribution is particularly preferably used directly above the light intensity Stronger, for example, has a peak intensity of light of -25 to 25. The light distribution is as shown in FIG. 9 , and has a Lambertian light distribution with a peak angle of light of 0 degrees and a half value angle of 60 degrees. The point light source (LED light source) is not particularly limited as a condition other than the light distribution described above, and for example, the type of the yellow phosphor is excited by the blue LED, or the green and red phosphors are excited by the blue LED. A single-wafer type of suspected white LED; a combination of red/green/blue LEDs to produce a white light multi-chip type, which in turn combines a suspected white LED of a single-wafer type of near-ultraviolet LED and red/green/blue phosphor, Red/green/blue laser group: etc. "The shape of the direct-type point source backlight is particularly excellent in brightness uniformity when the arrangement of the plurality of point sources is in a specific relationship with the triangular pyramid shape of the convex portion provided on the surface of the light diffusion plate. - Specifically From the viewpoint of brightness uniformity, t is preferably such that the surface of the light diffusing plate is periodically arranged in parallel with each other in a manner in which the sides of the adjacent convex portions are parallel to each other, and the plurality is straight (10) The point light sources are periodically arranged into a lattice skin, and the total light is cut and the light diffusing plate is in the same light... The at least one side of the angular center is in a positional relationship with the above-mentioned complex straight lines. The four corners are parallel or perpendicular to each other. The 'about the parallel position relationship' also includes the self-parallel offset 148960.doc

•32·201109741 士2. Within the above, the vertical positional relationship is also included from the vertical soil 20. The term "lattice" as used herein refers to the arrangement of the vertices of the square shape when the plane of the adjacent quadrilateral is coincident with the apex and the plane is filled in a square shape. Examples of the square shape include a square, a rectangle, a parallelogram, and the like. From the viewpoint of brightness uniformity and color unevenness characteristics, it is particularly preferable that the point light source and the light diffusing plate are at least one side of the bottom surface triangle of each convex portion of the light diffusing plate, and a lattice arrangement constituting the plurality of point light sources. The position of the shorter diagonal of the diagonal of the square of the square _β, as shown in Fig. 11, 'in the case where the convex portion of the light diffusing plate, that is, the triangular face of the triangular pyramid is an isosceles triangle' From the viewpoint of the brightness uniformity, it is more preferable that the bottom edge of the isosceles triangle of the convex portion and the diagonal line of the square of the lattice of the lattice arrangement of the point light source are in a parallel or perpendicular positional relationship. Preferably, the square shape of the lattice constituting the lattice-like arrangement is a rhombic shape in which the bottom edges of the isosceles triangles are arranged to face each other. Regarding the above parallel positional relationship, the self-parallel offset soil 2 is also included. Within the above, the relationship between the above-mentioned 吉吉々々r @Μ衣Μ' also includes a vertical offset of ±2. From the viewpoint of the uniformity of luminance and the characteristics of the π sentence, it is preferable that the base of the base of the convex base and the base of the lattice of the point light source are arranged in a square shape. The shorter diagonal line of the line is in a vertical position and is further closed when the triangle of the triangular pyramid of the diffuser plate is an equilateral triangle. It is further preferred from the viewpoint of brightness uniformity, the above-mentioned convex portion 148960.doc 33-201109741 One side of the regular triangle of the bottom surface and the diagonal line of the square of the lattice of the grid-like arrangement of the point source are in a parallel or perpendicular position relationship, as shown in FIG. 2, and further preferably constitute a grid of the above-mentioned lattice configuration. The square shape is a rhombic shape in which the bottom faces of the regular squares are opposed to each other. Regarding the above parallel positional relationship, the self-parallel offset soil 2 is also included. Within the above, the positional relationship of the above vertical direction also includes a shift of ±2 from the vertical. From the viewpoint of the uniformity of the 0 cm and the color unevenness, it is particularly preferable that the _• side of the convex triangle on the bottom surface of the convex portion and the diagonal of the square of the lattice which constitutes the lattice arrangement of the point light source are The shorter diagonal is in a vertical positional relationship. It is preferable that the point light sources constituting the backlight of the direct type point light source of the present embodiment are arranged such that the distances of the respective point light sources are arranged as uniformly as possible. Specifically, it is preferable to adopt a method of arranging a point light source on a kneading surface, that is, a longitudinal square and a lateral direction of the light diffusion plate at equal intervals, in a square lattice or a rectangular lattice shape (FIG. 13, which constitutes a lattice) : Fang Fang, or a method in which the point light source is arranged in a zigzag (lattice) shape in the longitudinal direction and the lateral direction of the kneading surface (Fig. Η, the square shape of the lattice: the rhombic shape). In particular, it is more preferable from the viewpoint of improving the brightness uniformity, and the arrangement of the ore-like shape is as shown in FIG. 14, when the horizontal and vertical light of the backlight (light diffusing plate) disposed in a jin is arranged as u 1 , nl / n2 is preferably 〇 26~3 87 ..... η2 is 0.46~0.75 or 1.33~2 and further preferably [use] 2_18 is best one. 148960.doc 34· 201109741 The light diffusing plate is tied to The surface (preferably the side opposite to the light source side of the light source group) has two portions of a plurality of substantially triangular pyramid shapes, thereby being used for backlighting of a direct type point source: when the brightness is increased and the brightness is uniform. Improve the effect of 'especially positive = :: brightness uniformity in the direction of view. Therefore, The direct-type point source backlight can achieve the point that the prior art cannot achieve the reduction of the number of sources, the reduction of the optical film, and the thinning of the backlight for the liquid crystal τν (10) including the direct-type point source backlight device, == illuminating device The advertisements are digitally kanban. The following is a description of specific examples and examples of the fathers of the Hanbi season. However, the present invention is not limited to these. The main measurement values in the examples were measured by the following methods. (1. Shape of the light-emitting surface of the light-diffusing sheet) &lt;1-1 Surface shape&gt; The light-emitting surface side of the light-diffusing sheet was observed by a laser microscope of Gener's k-Generati〇nII νκ·97〇〇, and the convex surface was observed. The shape of the part. &lt;1 -2 b, c, d, LV value&gt; Regarding the values of b, c, d, and g, for the convex shape of the convex pyramid or the concave portion, the apex (or the bottom point of the concave portion) A section cut along a plane perpendicular to one side of the bottom triangle is observed in the same manner as the above-mentioned <丨-^, and the shape is observed. b, c, and d are respectively shown in Fig. 5, and are passed through the following points. ,] point and 6 vertices (in the convex part) In the case of the shape of the triangular frustum, the top surface of the convex portion is cut and the bottom surface of the convex portion is cut into the cut surface where the convex portion is cut at the plane of the three points of the top three I48960.doc •35-201109741 The angle θ formed, which satisfies the following formulas 〇,) and (2), the length & value of the projection line segment projected onto the horizontal plane will be located on the bottom side of the convex portion B (10) to the projection line of the horizontal plane The length (c value); and the length (d value) of the projection line segment that projects the portion 〇 located on the top side of B to the horizontal plane. (1') . · · ΘΊ40Α〇+ 115·2ο I point. The apex (in the case of ΑΑ μ , 1 convex ° Ρ is the shape of the truncated cone shape, the center of gravity of the top triangle) is vertically projected to the point of the bottom triangle. Point J: From the above m, the intersection of the perpendicular line and the side when the perpendicular line is drawn from the side closest to the above (10) among the sides of the bottom triangle. For example, as shown in Fig. 23 (A) and (8), the g-values are formed on the plane perpendicular to the bottom triangle and are cut by the following I, point, and cut. In the early side portion of the center to the & winter Γ point, the angle θ formed by the above-mentioned convex-side (4) is located at an angle θ with respect to the (four) and the bottom surface, and satisfies (7): the projection of the portion on the top side to the horizontal plane When the plurality of segments of the line segment 8 are in a plurality of cut surfaces satisfying the above conditions, the cut surface having the largest value of g is used. Unloading Obstacle 峨 Case ′ The apex of the face triangle t: two straight::: the point of the bottom triangle, the point in the line connecting the bottom. And subtracting the vertex J' point of the bottom triangle: the vertical line and the side when the vertical line is drawn from the edge of the edge of the bottom triangle which is the closest to the point of the above Γ l4S960.doc • 36-201109741 Intersection. (the inclination angle Θ (degree) of the side surface of the convex portion (concave portion) with respect to the bottom surface (opening surface) &gt; The cross-sectional observation of the light-emitting surface of the light-diffusing sheet is performed in the same manner as in the above &lt;1-2&gt;, and the side surface and the bottom surface are measured. The resulting tilt angle (Θ). &lt; 1-4 The angle F (degree) formed by one side of the bottom face triangle of the convex portion and the diagonal of the square lattice constituting the lattice of the point light source&gt; is the same as the above &lt;1 - 1 &gt; Observing the triangular pyramid shape of the convex portion on the light-emitting surface side of the light-diffusing sheet, as shown in FIG. 15, the shorter diagonal line and the convex portion among the diagonals of the square shape constituting the lattice-arranged lattice of the light source The smallest angle among the angles formed by one side of the bottom triangle is set to the F value (degrees). &lt;1-5 Internal angle of the bottom triangle of the convex portion (α, β, γ)&gt; Similarly to the above &lt;1-1&gt;, the light-emitting surface side of the light-diffusing sheet was observed by a laser microscope, as shown in Fig. 6 'Evaluate the internal angles α, β, γ 〇 (2·refractive index a) of the bottom triangle of the convex portion. (a) Use a transparent (transparent resin) in the material for the lens layer to make a sheet of 0.3 mm thick. 18 K7142, using the Abbe refractometer to find the refractive index Α. (3_Average reflectance R(〇/〇)) The iUV3i5〇 spectrophotometer manufactured by Shimadzu Corporation was used, and the incident angle of the self-light diffusing plate was inclined by 7 degrees from the vertical line with respect to the horizontal plane of the light diffusing plate. The light having an incident wavelength of 45 〇 to 75 〇 (10) has a reflectance for each wavelength 1 'the average value is set to an average reflectance R (%). The average reflectance R (%) is obtained as the average value of the sulfuric acid lock of the standard plate I48960.doc -37·201109741 The reflectance is determined as the surface 'with the relative value (4_total light transmittance) &lt;4-1 .The total light transmittance of the light diffusing plate is several (%)&gt; The method of measuring the total light transmittance of the turbidity meter K7105 manufactured by Sakamoto Denshoku Industries Co., Ltd. regarding the light diffusing plate using NDH2000' is based on JIS Tb. Further, when the (4) lens layer and the (8) diffusion layer of the light diffusion plate are the same layer, when the (4) layer and the (b) layer are continuous layers, and the (4) layer and the (b) layer are separated layers, In the case of the layer (4) layer and the (8) layer, the surface of the press-molded article is measured by smoothing the surface by a hot press or the like. The total light transmittance (%) in the case of incident light from the light-emitting side is determined by a method using J1S K 71 〇5 using a turbidimeter manufactured by Nippon Denshoku Industries Co., Ltd. The total light transmittance τ (%) in the case where the light is incident on the light side. Further, when the (a) lens layer and the (b) diffusion layer are separate layers, the q) layer and the (b) layer are overlapped so that the side of the (4) layer in which the convex portion is formed faces outward, from the lens side of the (4) layer. The value obtained by the incident light is the total light transmittance τ (%). (5. Diffusion rate S (%)) Measurement of the brightness of transmitted light of light incident at a light incident angle in a transmission mode using a GC5〇〇〇L variable angle photometer manufactured by Nippon Denshoku Industries Co., Ltd. The diffusivity s of the light diffusing plate was obtained by the following formula. Furthermore, in the case where the (a) lens layer and the (b) diffusion layer of the light diffusion plate are the same layer, when the (a) layer and the (b) layer are continuous layers, and 148960.doc - 38-201109741 When the layer and the layer (b) are separated layers, the surface of the press-formed product is measured after the surface is smoothed by a hot press or the like in the state of the layer and the layer. The diffusion rate is S = 100x ( L (20 degrees) + L (7 degrees)) / (L (5 degrees) x 2) Here, . L (5 degrees) represents the transmitted light brightness (cd/m2) of the light emitted toward the angle of 5 degrees, L ( 20 degrees) indicates the transmitted light brightness (cd/m2) of the light emitted toward the angle of 20 degrees, and L (70 degrees) indicates the transmitted light brightness (cd/m2) of the light emitted toward the angle of 70 degrees. (6. The average tilt angle u (degrees) of the convex and concave portions) The light incident surface of the light diffusing plate was observed by a laser microscope, and the cross-sectional shape was analyzed at a width of 1000 μm in the longitudinal direction and the short-side direction of the diffusing plate to obtain a continuous width of 1000 μπι. The average tilt angle of the μιη width (inclination angle with respect to the horizontal plane), the average tilt angle of each length direction and the average tilt angle of the short side direction are calculated. Then calculate the average value and set the average tilt angle U. (7. Average LED interval Ρ) Divide the screen area of the display using the LED light source backlight by the number of installed LEDs, and set the square root of the value to the average LED interval. P(mm). (8. Average distance η between the uppermost part and the light diffusing plate) For all LEDs installed, measure the distance between the uppermost part of the LED installed in the backlight of the LED light source and the light diffusing plate (mm) The average value is set to the average distance η between the uppermost part of the LED and the light diffusing plate. (9. Average brightness) 148960.doc 39·201109741 A light diffusing plate and a specific optical film are arranged in the backlight of the LED light source to light the LED. The brightness and chromatic aberration were measured using Prometric of Cybernet Inc. Further, the camera was placed at a position 1 m above the center of the backlight of the LED light source, and the measurement was performed on the face of the backlight of the LED light source used in the examples and the comparative examples. 306 mm&gt;&lt;306 mm, 340 mm&gt;&lt;340 mm, or 400 mm&gt;&lt;400 mm, the brightness measurement portion is the 200 mm x 200 mm portion of the center portion of the above picture portion, and the brightness is measured with a resolution of 300x300. The average value of the party degree measured by the above method is set to the average vanguard. (10. Brightness uniformity) &lt;10-1. Unevenness of brightness (front side)&gt; The above 200 measured using the above (9. Average brightness) The luminance data of the mm&gt;&lt;200 mm portion is calculated to be uneven in brightness. Specifically, as shown in FIG. 22, for the LED backlight, the vertical line on the screen directly above the LED, el, e2, and e3 (the three lines closest to the center of the screen), and the horizontal line on the screen, f, f2, and f3 (closest to The luminance data of the three lines on the screen center are used to determine the standard deviation of the luminance ratio (the moving average of the luminance/brightness) of each line, and the average value of the obtained standard deviation values is set as the brightness unevenness. The measurement point is 24649 points of 157 χ horizontal 157. Here, the moving average means the average value of a specific section, and specifically, the average luminance of a line connecting adjacent LEDs. For example, the data of the brightness on the e 1 directly above the LED is set as A, B, C, D, E, F, G, H, I, J, K, L, M, N. Doc -40- 201109741 When the shape is 'the brightness data directly above the LED is a, e, i, n. In the case of the it shape, the moving average value at point c is A to E (the interval at which the adjacent LEDs exist), and the moving average value at point D is the average value Dav of B to F. The moving average of each point is obtained from the above points. "- Person, find the brightness ratio at each point (the moving average of brightness/brightness), for example, C/Cav, R/R ca^ -r- X- B/Bav, ..., and then find the above brightness The standard deviation obtained in the above manner is the standard deviation of the luminance ratio of the luminance data on el. &amp; Based on the above points, the standard is also obtained for other e2, e3, η, 乜, 〇 The deviation is finally calculated as the average value of the standard deviation obtained above, and is set as the luminance unevenness of the front side. &lt;10-2. Unevenness of latitude (strabismus)&gt;; The center of the light is 1 m above the center, At a position of 1 m in the horizontal direction, the camera is tilted 45 degrees toward the backlight, and the luminance distribution is measured using Pr〇metHc. j The luminance unevenness is calculated in the same manner as the above <9-1>, and the unevenness of the 1^ degree of the squint is set. Furthermore, the evaluation of the brightness unevenness is based on the following criteria. &lt;Brightness unevenness evaluation&gt; ◎: Brightness unevenness value 〇.0035 - The level of uneven brightness is not observed at all by visual inspection ◦ · 〇_〇036$ Brightness unevenness $〇〇〇49 148960.doc -41 · 201109741 — Observed slightly by visual inspection Degree of unevenness X: 0.0050S luminance unevenness value - level of uneven brightness observed by visual observation (11 · color unevenness) The above 200 mm &lt; 200 mm portion measured in the above (9·average luminance) was used. Color difference data, calculate excellent unevenness (maximum color difference). The measurement point is to divide the above 2〇〇mmX2〇〇mm into 157x 157 of 24649 points. Specifically, s 'so-called color difference data refers to the figure shown in Figure 22. The color difference data represented by the following formula in the range of 2 〇〇 mm x 2 〇〇 mm from the color unevenness reference point. The maximum color difference value is taken as the maximum color difference in the color difference data. Color unevenness = ((, -1^) Called))) 2), 丨 』 &lt;利)) 2 wide u'i, j, ν': 24649 points of each color U'ref (i, j), V'refm: reference point (screen center (coordinates (色, 〇)) Chromaticity &lt;Color unevenness evaluation&gt; ◎: Color unevenness S 0.0035 - Level of color unevenness observed completely by visual inspection 0.00: 0.0036 $ Color unevenness $ 〇0049 - slightly observed by visual inspection To the level of color unevenness X: 0.0050$ Color unevenness - the level of color unevenness observed by visual inspection second 'for manufacturing examples The method for producing the pressed original sheet used in the light diffusing plate of the comparative example will be described. 148960.doc -42·201109741 The following pressed original sheets are subjected to hot pressing treatment as described in the following examples and comparative examples. The film was processed into a light-diffusing sheet. (1. Pressing the original plate 1) Using a Henschel mixer, a polystyrene resin having a refractive index of 1.59 (Styron G9504, manufactured by PS Japan Co., Ltd.) was 99.97 parts by mass and an average particle diameter of 5 μm. 0.3 parts by mass of acrylic cross-linked particles (manufactured by Sekisui Chemicals Co., Ltd., Techpolymer ΜΒΧ-5), and melted at a resin temperature of 230 ° C in a twin-screw extruder (ΤΕΜ-58, manufactured by Toshiba Machine Co., Ltd.). Mix and granulate. The pellets were again melt-kneaded in a TEX-90 single-axis extruder and extruded from a T-die of a width of 1 000 mm to produce a sheet of 1.5 mm thickness. (2. Pressing the original plate 2) 99.95 parts by mass of a polystyrene resin having a refractive index of 1.59 (Styron G9504, manufactured by PS Japan Co., Ltd.) and an acrylic crosslinked particle having an average particle diameter of 5 μm by a Henschel mixer (water storage) Manufactured by Chemical Industries, Inc., Techpolymer ΜΒΧ-5) 0.5 parts by mass, mixed with a twin-screw extruder (manufactured by Toshiba Machine Co., Ltd. ΤΕΜ-5 8) at a resin temperature of 23 °C. grain. The pellets were again melt-kneaded by a TEX-90 single-axis extruder and extruded from a T-die of a width of 1000 mm to produce a sheet of 1.5 mm thickness. (3. Pressing the original plate 3) Using a Henschel mixer, 99.92 parts by mass of a polystyrene resin having a refractive index of 1.59 (Styron G95 4 manufactured by PS Japan Co., Ltd.) and an acrylic crosslinked particle having an average particle diameter of 5 μm (Manufactured by Sekisui Chemicals, Inc., 148960.doc •43-201109741

Techpolymer MBX_5) was mixed in an amount of 8 parts by mass, and granulated by melt-kneading at a resin temperature of 230 ° C in a twin-screw extruder (TEM-58, manufactured by Toshiba Machine Co., Ltd.). The pellets were again melt-kneaded in a TEX-90 single-axis extruder and extruded from a T-die of 丨〇〇〇 mm width to produce a sheet of 15 mm thick. (4. Pressing the original plate 4) Using a Henschel mixer, a polystyrene resin having a refractive index of 159 (manufactured by ps Japan Co., Ltd., G9504) 99 9 parts by mass and an acrylic crosslinked particle having an average particle diameter of 5 μm ( Manufactured by Sekisui Chemicals Co., Ltd., TeChP〇lymer 5·5)^ parts by mass, mixed with a twin-screw extruder (TEM-5 8 manufactured by Toshiba Machine Co., Ltd.) at a resin temperature of 23 (rc) The pellets were melted and kneaded again by a TEX-90 single-axis extruder, and extruded from a T-die of 1 mm width to prepare a sheet of 15111 〇 1 thick. (5_Prepressed original sheet 5) A mixture of 99 97 parts by mass of polyester resin (manufactured by 〇saka Gas Chemicals Co., Ltd., 〇Κϊ&gt;4ΗΤ) and MS-based crosslinked particles having an average particle diameter of 5 μm (manufactured by Sekisui Kogyo Co., Ltd.) , Ding 017, SMX_5R) 0. 50 parts by mass, and granulated by melt-kneading at a resin temperature of 27 〇〇c in a twin-screw extruder (TEM-5 8 manufactured by Toshiba Machine Co., Ltd.). -90 single-axis extruder remelting and mixing the above particles again, from ι〇〇〇mm Extruded in a T-die of width to make a sheet of 15〇1〇1 thick. (6_Prepressed original board 6) 148960.doc •44· 201109741 Using a Henschel mixer, a cycloolefin resin with a refractive index of 1.53 (曰99.97 parts by mass of Zeonex 480), mixed with 0.30 parts by mass of agglomerated crosslinked particles having an average particle diameter of 4.5 pm (manufactured by Momentive Co., Ltd., Tospearl T145), as a twin-screw extruder (Toshiba Machine Co., Ltd.) Manufacture of TEM-5 8) granulation by melt-kneading at a resin temperature of 270 ° C. The granules were again melt-kneaded by a TEX-90 single-axis extruder and extruded from a T-die of a width of 1000 mm. A sheet having a thickness of 1.5 mm was produced. (7. Pressing the original sheet 7) 99.97 parts by mass and an average particle diameter of a polydecyl acrylate resin (Delpet 80N manufactured by Asahi Kasei Chemical Co., Ltd.) having a refractive index of 1.49 using a Henschel mixer 5 μηι of polystyrene-based crosslinked particles (manufactured by Konica Chemical Co., Ltd., SX-350H), 0.30 parts by mass, and a biaxial extruder (TEM-5 8 manufactured by Toshiba Machine Co., Ltd.) at a resin temperature of 240 ° C Melt and knead for granulation. TEX-90 uniaxial extrusion The above particles were melted and kneaded again, and extruded from a T-die of a width of 1000 mm to form a sheet of 1.5 mm thick. (8. Pressing the original plate 8) Using a Henschel mixer, a polytrifluoro gas having a refractive index of 1.42 was used. 99.95 parts by mass of vinyl resin (manufactured by Daikin Industries Co., Ltd., M-300P), mixed with 0.50 parts by mass of acrylic crosslinked particles (manufactured by Sekisui Chemicals Co., Ltd., Techpolymer SMX-5R) having an average particle diameter of 5 μm, in two-axis An extruder (TEM-58 manufactured by Toshiba Machine Co., Ltd.) was melt-kneaded at a resin temperature of 250 ° C to be granulated. 14B960.doc -45- 201109741 The above pellets were again melt-kneaded in a TEX-90 single-axis extruder and extruded from a T-die of 1 mm width to make a sheet of 15 mm thick. (9. Pressing the original plate 9) Using a Henschel mixer, a polystyrene resin having a refractive index of 丨59 (ps)

Made of Japan, Styron G9504) 99.97 parts by mass, mixed with 0.045 parts by mass of acrylic crosslinked particles (manufactured by Sekisui Chemicals Co., Ltd., Techpolymer ΜΒΧ-5) having an average particle diameter of 5 μηι, in a twin-screw extruder (Toshiba Machine) The company manufactures ΤΕΜ-5 8) at a resin temperature of 230. (The granulation was carried out by melt-kneading under conditions: PTFE-90 single-axis extruder and ΤΕχ_65 single-axis extruder, respectively, and the above pellets and polyacetonitrile resin (manufactured by PS japan, G95 04) were again The melt-kneading was carried out by two layers of two layers of a layer thickness jaw claw and a jaw claw, and was extruded from a T-die (feed module mold) having a width of 1000 mm to prepare a sheet having a thickness of 1.5 mm. (10. Pressing the original plate 10) Using a TEX-90 single-axis extruder, a polystyrene resin having a refractive index of 1.59 (manufactured by PS Japan, Styron G9504) was used to have a width of 1000 mm at a resin temperature of 23 Torr. The τ mold was extruded to produce a 〇 3 mm thick sheet. (11. Pressing the original sheet 11) Using a TEX-90 single-axis extruder, the refractive index of 1.59 was gathered at a resin temperature of 23 Torr. Stupid vinyl resin (made by ps japan)

Styron G9504) extruded from a T-die of 1000 mm width to make a sheet of ^^ mm thick. 148960.doc -46-201109741 (12. Pressing the original plate 12) Using a Henschel mixer, a polystyrene resin having a refractive index of 5959 (manufactured by ps Japan, Styr〇n G95〇4) 99 95 parts by mass, Acrylic-based crosslinked particles (manufactured by Sekisui Seisakusho Co., Ltd., TeChP〇lymer ΜΒΧ_5) 〇. 2 parts by mass, mixed with a biaxial extruder (manufactured by Toshiba Machine Co., Ltd. ΤΕΜ-5 8) in a resin The temperature is 23 〇. (The conditions were: melt-kneaded under the conditions of granulation. The pellets were melted and kneaded again in a D-EX-90 single-axis extruder, and extruded from a T-die of 1 mm width to make! 5 mm thick (13. Pressing the original plate 13) A polymethyl methacrylate resin having a refractive index of 1.49 at a resin temperature of 24 Torr in a TEX-90 single-axis extruder (made by Asahi Kasei Chemical Co., Ltd., Delpet) 80N) Extrusion from a die of 1000 mm width to produce a sheet of 1.0 mm thick. (14. Pressing the original plate 14) Using a Shelter mixer, a cycloolefin resin having a refractive index of 35 3 (曰本99.97 parts by mass of Zeon Nex 480), mixed with 0.05 mass parts of polyanthracene-based crosslinked particles having an average particle diameter of 45 em (manufactured by M〇mentiVe, T〇speari T145), and extruded in two axes. The machine (manufactured by Toshiba Machine Co., Ltd., ΤΕΜ-5 8) was granulated by melt-kneading at a resin temperature of 270. The granules were again melt-kneaded by a TEX-90 single-axis extruder, from 1 mm. Extruded in the width of the T-die, and made a thin slice of melon.

Next, the LED type and the arrangement method of the LEDs in the light source unit of the light source backlight of the LED I48960.doc • 47-201109741 used in combination with the light diffusing plate in the examples and the comparative examples will be described. (1. LED type) &lt;1-1. LED-1&gt; The peak angle of light manufactured by Cree is 0 degree i*gLED(LM6-£"1^1-03^3) (light distribution is shown in Figure 9) &lt;1-2. LED-2&gt; A white LED (LUXION EMITTER) with a peak angle of ±25 degrees of LED light manufactured by Philips Lumileds Co., Ltd. (light distribution is shown in Fig. 19) ° &lt;1-3. LED-3&gt LUXION EMITTER with LED peak angle of ±37 degrees by Philips Lumileds (light distribution is shown in Figure 20) ° (2.LED backlight) &lt;2-1. LED backlight 1&gt; (PCB (printed circuit board)) The white LED is mounted as shown in Fig. 14 and installed in a sawtooth configuration (configuration 1) with LED spacing η 1 : 55.8 mm and n2 : 3 2.2 mm (nl /n2 = 0.58 (refer to Figure 14)), an LED light source backlight evaluation device with a face size of 306x306 mm is produced. At this time, the average LED interval P is 30 mm. Using a double-sided tape, the LED base is mounted with an LED ( MC-PET (manufactured by Furukawa Electric Co., Ltd.) with a diffuse reflectance of 95% is attached as a reflective film, 148960.doc -48- 201109741 The distance h between the reflective film and the uppermost portion of the LED is maintained. It is 1.5 mm (refer to Fig. 8). Next, the light reflection plate is fixed above the reflection film so that the distance Η between the uppermost portion of the LED and the light diffusion plate is 16 mm, and the LED backlight 1 is formed (refer to FIG. 8). The backlight is lit by a current of 20 mA flowing through one LED. The measurement of brightness and brightness unevenness is performed after the LED is turned on, and the backlight is aged for one hour. <2-2. LED backlight 2> The light diffusing plate was fixed above the reflecting film so that the distance between the uppermost portion of the LED and the light diffusing plate was 14 mm. Other conditions were the same as in the above-mentioned <2-l. LED backlight 1&gt; LED backlight 2 is formed. &lt;2-3. LED backlight 3&gt; The light diffusion plate is fixed above the reflection film so that the distance Η between the uppermost portion of the LED and the light diffusion plate is 12 mm. &lt;2-1. LED backlighting Similarly, a backlight evaluation device is fabricated to form an LED backlight 3. <2-4. LED backlight 4&gt; On the LED base (PCB), a white LED is shown in Fig. 14, Install 100 pieces in the ore configuration (configuration 2) with LED spacing nl : 63 ·3 mm, n2 : 36.5 mm (nl/n2=0.5 8) 14)), to produce a screen size of 340x340 mm LED light source of the backlight apparatus. At this time, the average LED interval P is 34 mm. 148960.doc -49- 201109741 Other conditions are the same as the above <2-l. LED backlight 1>, forming an LED backlight 4 ° &lt; 2-5. LED backlight 5 &gt; On the LED base (PCB), the white LED As shown in Fig. 14, 100 pieces (nl/n2 = 0.58 (refer to Fig. 14)) are mounted in the ore-shaped configuration (configuration 3) with LED spacing nl: 74_4 mm and n2: 43.0 mm, and the screen size is 400x400 mm. LED light source backlight device. At this time, the average LED interval P is 40 mm. Other conditions are the same as the above-mentioned <2-l. LED backlight 1&gt;, and the LED backlight 5 is formed. Next, the optical films used in the examples and comparative examples will be described. (1. Optical film 1) Diffusion sheet: BS-912 (Huihe Co., Ltd.) Using a variable angle photometer (GC5000L manufactured by Nippon Denshoku Industries Co., Ltd.), a single color of 550 nm incident at an incident angle of 60 degrees was measured. The main peak angle of the light distribution at the time of light is 38 degrees. (2. Optical film 2) Lens sheet: PTR733 (manufactured by Shinwha Intertek Co., Ltd.) Using a variable angle photometer (GC5000L manufactured by Sakamoto Denshoku Industries Co., Ltd.), when monochromatic light of 550 nm is incident at an incident angle of 60 degrees The main peak angle of the light distribution is 42 degrees. (3. Optical film 3) Bracts: BEFIII (manufactured by Sumitomo 3M Co., Ltd.) Using a variable angle photometer (GC5000L, manufactured by Nippon Denshoku Industries Co., Ltd.), 148960.doc -50-201109741 550 nm is incident at an incident angle of 60 degrees. The main peak angle of the light distribution in monochromatic light is 27 degrees. (4. Optical film 4) Brightness-enhanced sheet: DBEF-D400 (manufactured by Sumitomo 3M Co., Ltd.) Using a variable angle photometer (GCsoooq, manufactured by Nippon Denshoku Industries Co., Ltd.), when monochromatic light of 550 nm is incident at an incident angle of 60 degrees The main peak angle of the light distribution was found to be 56 degrees. [Example 1] The pressed original sheet 1 produced in the above manner was sandwiched into a stamper shaped into a specific shape, and put into a press at a press plate temperature of 18 〇〇c, pressing at a surface pressure of 100 kg/cm2 for 30 minutes. Thereafter, the stamper sandwiched between the pressed original sheets 1 was placed in a water-cooled press and cooled for 10 minutes. The light-diffusing sheet having a thickness of 15 mm which is shaped into a specific shape is taken out. The surface of the light-diffusing sheet obtained in the light-incident surface is a rough surface having a concave-convex shape having an average inclination angle of 10 degrees, and the surface on the light-emitting surface side. The convex portion formed periodically has a substantially triangular pyramid shape (a regular triangular frustum shape) (see FIG. 21). Further, the inclination angle 大致 of the substantially triangular pyramid of the convex portion of the light diffusion plate is 62 degrees. The part b shown in Fig. 5 is 89 pm, part c 1 μιη, d part is 10 μηι, and the g portion described in Fig. 23(A) and (Β) is 1 μπι 〇, and the light diffusing plate is measured for incident light from the convex lens side. 148960.doc 201109741 The total light transmittance τ was 84%, and it was confirmed that the average reflectance R of the light diffusing plate was 46%, and there was no return reflection characteristic. The light diffusing plate produced in the above manner was used as a light diffusing plate. The one side of the bottom right side of each convex portion is mounted in the LED backlight i in such a manner that the diagonal of the square of the square of the led arrangement of the LED backlight is parallel (F==0.), and the light diffusing plate is mounted on the light diffusing plate Two diffusion sheets, a brightness enhancement film, and measurement unevenness (front and squint) and color unevenness are placed on top of each other. The brightness is 5340 cd/cm2, and the brightness of the front side is not 〇〇〇. 44. The brightness of the squint observed from the inclination of 45 degrees was not 〇〇〇48, and the color unevenness (maximum color difference) was 0.0045'. The results of the evaluation were shown in Table 1 below. [Example 2~ 8], [Comparative Examples 1 to 4] The stamper was changed. Other conditions were the same as in Example 1. The light diffusing plate was prepared in the same manner, and the luminance, unevenness in brightness (front and squint), and color unevenness of the backlight were measured in the same manner as in Example i. In the obtained light diffusing plate, the surface on the light incident surface side had an average tilt angle of The rough surface shape of the unevenness of 10 degrees, the surface of the light-emitting surface side is a periodically formed convex portion having a substantially triangular pyramid shape (a regular triangular frustum shape) (reference circle 21) ° Light diffusion obtained in each of the examples and the comparative examples The inclination angle of the substantially triangular pyramid of the convex portion of the plate is as shown in the following Table 1. Regarding the luminance, uneven brightness (front and squint), and color unevenness, the light diffusing plates of the respective embodiments 148960.doc - 52 - 201109741 are Shows good results. The evaluation results are shown in Table 1 below. [Examples 9 to 17], [Comparative Examples 5 and 6] The stamper was changed, and the pressed original sheet 5 was used at a press plate temperature of 2 Torr. (:: press-forming was carried out under the conditions of a surface pressure of 100 kg/cm 2 . Other conditions were the same as in Example 1 to prepare a light-diffusing sheet, and the luminance of the backlight, the degree of unevenness of the party (front and squint), and the like were measured in the same manner as in Example 1. In the obtained light-diffusing sheet, the surface on the light-incident surface side has a rough surface shape having an uneven shape with an average inclination angle of 10 degrees, and the surface on the light-emitting surface side is a periodically formed convex portion having a substantially triangular pyramid shape. (Positive triangle frustum shape) (see Fig. 21) The inclination angle of the substantially triangular pyramid of the convex portion of the light diffusing plate obtained in each of the examples and the comparative examples is as shown in the following Table 2. Unevenness in brightness and brightness (positive The light diffusing plate of each of the examples showed good results. The evaluation results are shown in the following Table 2. [Example 18] On the stamper described in Example 3, the coating was carried out. After the thickness of the cloth is 3 〇〇^, the Lumipulse LPB-110 (manufactured by Mitsubishi Gas Chemical Co., Ltd.), the pressed original plate 1 is placed on the coating layer, and the metal halide irradiation device is irradiated with 2 J/cm 2 . After the layer is cured by ultraviolet light, In the same manner as in Example 1, the brightness of the backlight, unevenness in brightness (front and squint), and color unevenness were measured in the same manner as in Example 1. The light diffusing plate obtained in the obtained light diffusing plate was measured in the same manner as in Example 1. The surface of the human glossy side is a slit surface shape having an uneven shape having an average inclination angle of 1 degree, and the surface of the surface side is a periodically formed convex portion having a substantially triangular pyramid shape (a regular triangular frustum shape) ( Refer to 21). The inclination angles of the substantially triangular pyramids of the four portions of the light-diffusing sheet obtained in the examples are as shown in the following Table 3. Regarding the 7C degree, uneven brightness (front and squint), and color unevenness, examples The light diffusing panels all showed good results. The evaluation results are shown in Table 3 below. [Examples 19 to 23], [Comparative Examples 7, 8] The stamper was changed, and the pressed original sheet 6 was used at the press plate temperature 2压制c and a surface pressure of 100 kg/cm2 were subjected to press molding. Other conditions were the same as in Example 1. A light diffusing plate was produced, and the brightness and brightness unevenness (front and squint) of the backlight were measured in the same manner as in Example 丄. And uneven color 0 In the obtained light-diffusing sheet, the surface on the light-incident surface side has a rough surface shape having an uneven shape having an average inclination angle of 10 degrees, and the surface on the light-emitting surface side is a periodically formed convex portion having a substantially triangular pyramid shape (a regular triangular frustum shape) (shape) (see Fig. 21) ° The inclination angle of the substantially triangular pyramid of the convex portion of the light-diffusing sheet obtained in each of the examples and the comparative examples is as shown in the following Table 3. Regarding brightness and brightness unevenness (front and squint) and The light-diffusing sheets of the examples exhibited good results. The evaluation results are shown in Table 3 below. 148960.doc -54-201109741 [Examples 24 to 26], [Comparative Examples 9, 1 〇 ] Change the stamper and use the pressed original plate 7. In the same manner as in Example 1, a light-diffusing sheet was produced in the same manner as in Example 1, and the surface of the light-incident surface of the light-diffusing sheet obtained by measuring the brightness of the backlight, uneven brightness (front and squint), and color = 0 was measured in the same manner. The surface of the slit surface having the uneven shape having an average inclination angle of 10 degrees is a substantially triangular shape (positive triangular frustum shape) of the convex portion formed periodically (see 21). The inclination angle of the substantially triangular pyramid of the convex portion of the light-diffusing sheet obtained in each of the examples and the comparative examples is as shown in Table 3 below. Regarding luminance, uneven brightness (front and squint), and color unevenness, the light diffusing plates of the respective examples exhibited good results. The evaluation results are shown in Table 3 below. [Comparative Example 11] The stamper 8 was changed by changing the stamper. Further, press molding was carried out under the conditions of a press plate temperature of 20 (TC, surface pressure) of 1 〇〇 kg/cm 2 . Other conditions were the same as in Example i, and a light diffusing plate was produced, and the brightness of the backlight was measured in the same manner as in Example}. The unevenness of the brightness (front and squint) and the color unevenness. In the obtained light diffusing plate, the surface of the human light side is a rough surface having an uneven shape with an average inclination angle of 10 degrees, and the surface of the light emitting surface is periodic. The convex portion formed in the ground has a substantially triangular pyramid shape (a shape of a regular triangular frustum) (refer to FIG. 148960.doc-55-201109741 21). The convex portion of the obtained light diffusing plate is substantially shown in the triangular table 3. The inclination angle of the double pyramid The results of the above-mentioned case are not as follows: The results of the front and squint brightness unevenness are changed. The detailed evaluation results are shown in Table 3 below. [Comparative Examples 12 to 20] The stamper was changed. Other conditions and implementation Example i A light diffusing plate was produced in the same manner, and the degree of acceptance of the backlight, uneven brightness (front and squint), and color unevenness were measured. In the obtained light diffusing plate, the surface on the light incident side has an average tilt angle of 丨〇. Rough shape of concave and convex shape In the shape, the surface on the light-emitting surface side has a substantially triangular truncated cone shape (Comparative Examples 12 to 14) in which the concave portion is formed periodically, a substantially quadrangular frustum shape of the convex portion (Comparative Examples 15 to 17), or a substantially triangular frustum shape of the concave portion (Comparative Example) 18 to 20) The evaluation results of the obtained light-diffusing sheet are shown in the following Table 4. [Comparative Example 21] A light-diffusing sheet was produced in the same manner as in Comparative Example 20 described above, and was mounted on the LED backlight 1 in the light-diffusing sheet. Two diffusion sheets, one sheet each, and a brightness enhancement film were placed one on top of the other, and luminance, uneven brightness (front and squint), and color unevenness were measured. The evaluation results are shown in Table 4 below. [Comparative Example 22] A light-diffusing sheet was produced in the same manner as in Comparative Example 20 described above, and was attached to an LED backlight 148960.doc-56-201109741, a sheet of diffusion sheet, and an unevenness of the ribs of each sheet (front side and squint) to be 1 in the light diffusing sheet. The lens and the brightness enhancement film were placed one on top of the other, and the brightness and color unevenness were measured. The evaluation results are shown in the following Table 4. [Comparative Examples 27 to 42] The stamper was changed. Other conditions were the same as in Example i. Diffuser plate, measure the redundancy and brightness of the backlight (front side and squint) and color unevenness. In the obtained light diffusing plate, the surface of the human light side is a chain shape having a concave-convex shape having an average inclination angle of H), and the surface on the light-emitting surface side is periodically formed. The convex portion is substantially in the shape of a triangular pyramid. The evaluation results of the obtained light diffusing plate are shown in Table 5 below. [Comparative Examples 43 to 50] The stamper was changed. On the other hand, a light diffusing plate was produced in the same manner as in the above-mentioned Example 9, and the degree of back light, uneven brightness (front and squint), and color unevenness were measured. In the known light diffusing plate, the surface on the light-incident surface side has a rough surface shape having an uneven shape with an average inclination angle of 10 degrees, and the surface on the light-emitting surface side has a substantially regular triangular pyramid shape in which the convex portion is periodically formed. The evaluation results of the obtained light diffusing plate are shown in Table 6 below. [Examples 51, 52, 53, 56, 57] As the pressed original sheets, the pressed original sheets i (Example 5), the pressed original sheets 12 (Example 52), the pressed original sheets 2 (Example 53), and the pressed original sheets were respectively used. 3 (Example 56), the original plate 4 was pressed (Example 57). 148960.doc -57-201109741 Other conditions were prepared in the same manner as in the above-described Example 3, and luminance, uneven brightness (front and squint), and color unevenness of the backlight were measured. In the obtained light-diffusing sheet, the surface on the light-incident surface side has a rough surface shape having an uneven shape having an average inclination angle of 10 degrees, and the surface on the light-emitting surface side is a periodically formed convex portion having a substantially triangular pyramid shape (a regular triangular frustum shape) Shape) (Refer to Fig. 21) The evaluation results of the obtained light diffusing plate are shown in Table 7 below. [Example 58] The pressed original plate 12 was used. On the other hand, a light-diffusing sheet was produced in the same manner as in the above-mentioned Example 5, and the degree of relief of the backlight, uneven brightness (front and squint), and color unevenness were measured. In the obtained light-diffusing sheet, the surface on the light-incident surface side has a rough surface shape having an uneven shape having an average inclination angle of 10 degrees, and the surface on the light-emitting surface side is a periodically formed convex portion having a substantially triangular pyramid shape (a regular triangular frustum shape) Shape) (see 21). "," The evaluation results of the obtained light-diffusing sheet are shown in the following Table 7. [Example 59] The pressed original plate 14 was used. Other conditions were the same as in the above-described Example 19, and a light diffusing plate was produced, and the brightness and brightness of the backlight were measured. The surface of the light-diffusing sheet of the obtained light-diffusing sheet is a rough surface having a concave-convex shape having an average inclination angle of 10 degrees, and the surface on the light-emitting surface side is periodically formed. The convex portion has a substantially triangular pyramid shape (a regular triangular frustum shape) (see Fig. 21). 148960.doc • 58· 201109741 The evaluation results of the obtained light diffusing plate are shown in the following Table 7. [Example 54] In Example 53, a light-diffusing sheet was produced in the same manner, and the light-diffusing sheet was mounted on the light-diffusing sheet, and a diffusion sheet, a sheet, and a brightness enhancement film were placed one on top of each other, and luminance and brightness unevenness (front and squint) were measured. The results of the evaluation are shown in the following Table 7. [Example 55] A light diffusing plate was produced in the same manner as in the above Example 53 and mounted in the LED backlight 1 'two lens sheets were placed on the light diffusing plate. 1 piece of brightness The film was measured for measurement of brightness, brightness unevenness (front and squint), and color unevenness. The evaluation results are shown in the following Table 7. [Comparative Example 23] The pressed original plate 13 was used. The stamper was changed so that the surface on the light incident side was changed. A light-diffusing sheet was produced in the same manner as in Example 1. The brightness of the backlight, uneven brightness (front and squint), and color unevenness were measured. The surface of the obtained light-diffusing sheet on the light-surface side was The smooth surface of the average tilt angle, and the surface on the light-emitting surface side is a substantially triangular pyramid shape (corner cone shape) formed periodically, and has a reversion reflection characteristic. As a result, the shell degree drops significantly. The brightness uniformity (both front and squint) was also inferior. The evaluation results are shown in the following Table 7. [Example 60] 148960.doc -59-201109741 Using the pressed original sheet 9, the same stamper as in Example 3 was used. In the same manner as in Example 1, a light diffusing plate was produced, and luminance, unevenness in brightness (front and squint), and color unevenness of the backlight were measured. In the obtained light diffusing plate, the surface on the light incident side had an average tilt angle of 10 degrees The rough surface shape of the uneven shape, the surface on the light-emitting surface side is a substantially triangular shape of a convex portion (a regular triangular frustum shape) (see 21). The evaluation results of the obtained light-diffusing sheet are shown in Table 8 below. [Example 61] The pressed original plate 10 was placed in a press mold shaped into a specific shape and put into a press, and pressed at a pressing plate temperature of 18 (TC, surface pressure of 1 〇〇 kg/cm 2 for 30 minutes). After that, the stamper is clamped into the pressed original plate! The stamper is replaced and placed in a water-cooled press and cooled for 10 minutes. After cooling, the thickness of the specific shape is taken out from the stamper 〇3 (a) Lens layer 9

Formed light diffuser.

The unevenness of the shell (front and squint) was measured for luminance and color unevenness in the same manner as in the first embodiment. Shown in Table 8 below. Evaluation result of the obtained light-diffusing sheet 148960.doc -60.201109741 [Example 62] A (a) lens layer was produced in the same manner as in the above-described Example 61, and the original plate was superposed thereon as (b) a diffusion layer. A light diffusing plate of a separation layer configuration type is formed. In the same manner as in the above Example 61, luminance, luminance unevenness (front and squint), and color unevenness of the backlight were measured. The evaluation results of the obtained light diffusing plate are shown in Table 8 below. [Examples 63 to 66] A light diffusing plate was produced in the same manner as in the above Example 3, and led back lights 2, 3, 4, and 5 were used, respectively. In the same manner as in Example 3, the luminance, unevenness in brightness (front and squint), and color unevenness of the backlight were measured in the same manner. The evaluation results of the obtained light diffusing plate are shown in Table 9 below. [Embodiment 67] As shown in Fig. 22, on a LED base (PCB), white LEDs are mounted in an erroneous configuration with LED spacing nl: 5 5.8 mm, n2: 32.2 mm (nl/n2= 0.58 (refer to FIG. 14)), an LED light source backlight evaluation device having a screen size of 32 〇 x 32 〇 mm was produced. At this time, the average LED interval P is 30 mm. Secondly, on the LED base (PCB) on which the LED is mounted, Lumirror E6SL (manufactured by Toray Industries, Inc.) with a diffuse reflectance of 95% is attached as a reflective sheet, and the distance h between the reflective sheet and the uppermost portion of the LED is maintained. It is 1.9 mm (refer to Figure 8). Then, the light reflection plate is fixed to the upper side of the reflection sheet so that the average distance Η between the uppermost portion of the LED and the light diffusion plate is 20 mm. Two diffusion sheets are disposed above the light diffusion plate, and one piece is disposed above the light diffusion plate. Brightness increases the sheet. In the same manner as in the third embodiment, the light diffusing plate is made of 148960.doc -61 · 201109741 as the F value (one side of the bottom triangular shape of the convex triangular pyramid shape formed on the surface of the light diffusing plate, and the lattice of the point light source) The angle formed into the angle of _5 degrees is mounted in the LED backlight. Further, the backlight is lit by circulating a current of 20 mA in one of the LEDs. Thereafter, the average distance 11 between the uppermost portion of the LED and the light diffusing plate was reduced by φ mm, and the unevenness of the front and the inclination and the unevenness of the color were determined as a small distance ◎, which was 18 mm. The detailed results are shown in Fig. 7. Furthermore, the measurement of the uneven brightness is performed after the LED is turned on and the backlight is aged for one hour. The evaluation results of the obtained light diffusing plate are shown in the following Table i. [Examples 68 to 77] The angle between the LED arrangement of the backlight and the convex triangular pyramid shape of the light diffusing plate: The F value was changed, and the average distance between the uppermost portion of the LED and the light diffusing plate was changed every 1 in the same manner as in the example 67. The mm was shortened, and the minimum distance between the front side and the inclined brightness unevenness and the color unevenness was determined. When the F value is -2, 0, or 2 degrees, when H = 16 mm, the unevenness of the front surface and the inclination and the unevenness of the color are obtained as excellent results. Further, when the F value is 28, 30, or 32 degrees, at 14 mm, the unevenness of the luminance of the front surface and the color unevenness are remarkably excellent. On the other hand, when the F value is 5, 15, 25, or 35 degrees, the unevenness of the front and the inclination and the unevenness of the color are ◎, and the minimum distance is 18 mm. The evaluation results of the obtained light diffusing plate are shown in Table 10 below. [Examples 78 to 80] 148960.doc • 62·201109741 A light diffusing plate was produced in the same manner as in Example 3 except that the stamper was changed. The light diffusing plate was attached to the backlight in the same manner as in Example 69, and the LED was mounted. The average distance 最 between the uppermost portion and the light diffusing plate is shortened by 1 mm, and the luminance unevenness of the front surface and the tilt and the minimum unevenness of the color unevenness are obtained. The evaluation results of the obtained light diffusing plate are shown in Table 1 below. [Example 81] The enthalpy of the LED backlight 1 (distance from the light source to the light diffusing plate) was changed to 15 mm. On the other hand, a light-diffusing sheet was produced in the same manner as in the above-mentioned Example 3, and luminance, uneven brightness (front and squint), and color unevenness of the backlight were measured. The evaluation results of the obtained light diffusing plate are shown in Table 11 below. [Example 82;] The η (the distance from the light source to the light diffusion plate) of the LED backlight 1 was changed to 15 mm. Also, change the LED type to LED-2. On the other hand, a light diffusing plate was produced in the same manner as in Example 3, and luminance, uneven brightness (front and squint), and color unevenness of the backlight were measured. The evaluation results of the obtained light diffusing plate are shown in Table 11 below. [Example 83] The H of the LED backlight 1 (the distance from the light source to the light diffusing plate) was changed to 15 mm. Also, change the LED type to LED-3. On the other hand, a light diffusing plate was produced in the same manner as in Example 3, and luminance, uneven brightness (front and squint), and color unevenness of the backlight were measured. The evaluation results of the obtained light diffusing plate are shown in Table 11 below. 148960.doc -63- 201109741 Backlight characteristic color unevenness maximum color difference XX 〇 ◎ ◎ ◎ 〇〇〇〇 XX 0.0057 0.0055 _1 0.0045 0.0031 a ο d 0.0031 0.0047 0.0040 00042 0.0040 [α〇052 0.0054 brightness unevenness value _1 squint XX 〇 ◎ ◎ ◎ 〇〇〇〇 XX 0.0172 0.0124 0.0048 0.0022 0.0020 0. (8) 21 0.0045 0.0036 0.0037 0.0042 0.0071 0.0112 Front XX 〇 ◎ ◎ ◎ 〇 ◎ ◎ X 0.0158 0.0108 0.0044 0.0020 0.0017 0.0018 0.0042 0.0023 0.0025 0.0036 0.0038 0.0114 cd/cm2 5350 5340 __J 5340 5320 5330 5300 5010 5310 5300 5340 5350 5330 ※ η S 5 % =tt j BLU specification P/HI _1 00 00 00 00 -: 00 00 -: 00 00 2 00 oo —· 1.88 1.88 00 00 2 00 00 1.88 00 oo 2000 00" X mm \Ω v〇Ό v〇ο Q-. mm S 沄S 沄s Light diffuser characteristic layer composition ※ iiisi 9 isii Diffusion rate έ? (N (N CN (N (N &lt;;N CN (N CN &lt;N &lt;N (N total light transmittance 〇r-&gt; Q\ ΓΛ OS ΓΟ OS m 〇\ 〇\ m ON ΓΟ ON m ON m ON m OS E- 00 Ό oo s 00 SO 00 v〇 00 o 00 00 00 00 00 00 00 Reflectance oi r〇PO P; 00 V) s〇ON •nm »〇m Incident surface i D ttsi 〇ooo 〇〇o O ooo 〇Outlet shape shape &amp;〇ε — 一 — — — — — — Ό ε =L 〇ooooooooooo 〇ε a. — — — — — — ε =t OS 00 oo OS 00 Os 00 &lt;J\ 00 On 00 〇\ 00 On 00 ON 00 〇\ 00 ON 00 ON 00 &lt; ON Ό 1.59 1.59 1.59 1.59 1.59 1.59 1.59 1.59 1.59 ON o\ Ο Ό sss 55.5 54.5 m cs JO convex and concave shape roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex Triangular cone substantially convex triangular cone substantially convex triangular cone substantially convex triangular cone i substantially convex triangular cone substantially convex triangular cone substantially convex triangular cone substantially convex triangular cone comparative example 1 Comparative Example 2 Example 1 Example 2 Example 3 Example 4 Implementation Example 5 Example 6 Example 7 Example 8 Comparative Example 3 Comparative Example 4 -64· 148960.doc 201109741 The "#l" shown in the '5 stomach "optical 犋 ※ ※ ※" towel in Table 1 refers to light. Diffusion plate / diffusion sheet / diffusion sheet / brightness Constituting the film. The diffusion sheet is BS-912 (manufactured by Huihe Co., Ltd.). The above-mentioned exemption film is DBEF-D400 (manufactured by Sumitomo 3M Co., Ltd.). "※1" shown in the "layer composition ※" in Table 1 means a single layer. 148960.doc •65· 201109741

(N backlight characteristic color unevenness maximum color difference X 〇 ◎ ◎ ◎ ◎ 〇〇〇〇 X 0.0056 0.0046 0.0033 0.0028 0.0028 0.0032 0.0045 0.0043 0.0044 0.0045 0.0053 Brightness unevenness squint X 〇 ◎ ◎ ◎ ◎ 〇〇〇〇 X 0.0152 0.0049 0.0027 0.0021 0.0020 0.0021 0.0043 0.0037 :0.0049 00109 Front X 〇 ◎ ◎ ◎ ◎ 〇 ◎ ◎ 〇〇 0.0144 0.0047 0.0024 0.0017 0.0016 0.0018 〇&gt; m ο ο 0.0023 w 0.0039 0.0048 Bright ^ cd/cm2 5340 5340 5330 5340 5330 5310 5000 5320 1 5300 5320 5330 Optical film arrangement ※ % S % % : «: BLU size Ρ / Η 00 oo 00 00 21.88 00 00 2 00 00 1.88 00 00 00 00 2 00 00 " 00 oo 00 00 — X mm VO VO VO v 〇ο VO VO ν〇CU mm s Twilight diffuser characteristics 1 layer composition ※ iiii 5 S s diffusivity (N fN &lt; N &lt; N fN (N (Ν (N (N (Ν &lt; N total light transmission) Rate r*-&gt; OS m ON ΓΛ ON ΓΛ ON CO Qs 〇\ ΟΝ ro ON m 〇\ ON ON Η \〇OO v〇00 00 Ό 00 \r\ 00 00 00 Ό 00 v〇00 ss 00 Reflectance Ίί so m 00 »n 〇\ v£ &gt; SO S » η Art 00 Incident plane D oooo 〇o Ο Ο ooo Exit surface shaping shape GO B η — one — — — one — ___ ! ;, rmm ο Ε 2L o O oooo ο ο ooou Β =L — One — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — &lt;x&gt; Ό r-&gt; v〇S 55.5 V) 54.5 convex and concave shape substantially convex triangular cone substantially convex triangular cone... roughly convex triangular cone substantially convex triangular cone roughly £b triangular cone roughly β triangular cone substantially convex triangle Cone substantially convex triangular cone 1 substantially convex triangular cone substantially convex triangular cone substantially convex triangular cone Comparative Example 5 Example 9 Example 10 Example 11 Example 12 Example 13 Example 14 Example 15 Example 16 Example 17 Comparative Example 6 -66· 148960.doc 201109741 Table 2 t ′′ “Optical film arrangement ※” is a structure of a light diffusing plate/diffusion sheet/diffusion sheet/brightness improving film. The above diffusion sheet is BS_912 (manufactured by Huihe Co., Ltd.). The brightness enhancement film described above is DBEF-D400 (manufactured by Sumitomo 3M Co., Ltd.). In the table 2, "※1" as shown in the "layer composition ※" refers to a single layer. 148960.doc •67· 201109741 m Backlight characteristic color unevenness maximum color difference ◎ X 〇〇〇〇〇XX 〇〇〇XX 0.0028 0.0055 _I 0.0044 0.0038 0.0042 0.0048 0.0043 0.0052 0.0052 0.0047 0.0043 Ό.0049 0.0052 Brightness unevenness | Strabismus I ◎ X 〇 ◎ ◎ Ο 〇 XX 〇 ◎ 〇 XX 0.0020 0.0121 _ί 0.0048 0.0033 0.0035 0.0045 0.0048 0.0082 0.0071 0.0046 0.0034 0.0047 0.0063 0.0066 Front ◎ X 〇 ◎ ◎ 〇〇〇 X 〇 ◎ 〇 XX 0.0016 0.0101 _1 0.0046 0.0028 0.0033 0.0041 0.0042 0.0047 0.0063 0.0040 0.0033 0.0044 1_ 0.0059 0.0061 Brightness cd/cm2 5470 5240 ; _1 5250 5240 5240 4920 5230 5230 5050 5060 5070 1 5040 4730 4900 ※ a Ξ % % % % BLU specification P/H 1.88 00 00 2 00 00 00 CO “ 00 00 — 00 00 00 00 “ 00 00 21.88 1.88 00 oo 1.88 00 00 21.88 X mm ^5 \〇VO ο Ό v〇〇\D 0^ mm s Twilight diffuser characteristics i 1 1 layer composition ※ iiisii S ii Diffusion rate ^ 〇0 cs &lt;N CN (N (N (Ν (N &lt;Ν &lt;N &lt;N &lt;N (N CN) Rate -D ο m os cn ON m ON ON ΓΛ 〇\ m Os Γ〇σ\ m Ο m σ\ ΓΛ Os m ON m ON m 〇Η s; V) 00 00 00 00 00 ό 00 Ό 00 00 * r&gt; 00 00 irj 00 00 00 Reflectance oC 00 Ό tn m VJ &lt;n jn 妄α\ m *r\ Write 00 m Incident plane D Ο 〇〇Οo 〇〇Ο o ο ο Ο oooo Exit surface shaping shape Ofl ε — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — 00 OS 00 ON 00 ON 00 o 00 ΟΝ 00 Os 00 ΟΝ 00 OS 00 〇\ 00 o\ 00 ON 00 ON 00 o\ 00 &lt; 1.71 ΓΛ ro «η rj WJ m 1.53 1.53 1.49 1.49 1.49 1.49 I 1.49 1 ! (N VO 55.5 «ο «ο &lt;Ν •Ο s 00 v〇»n convex and concave shape roughly convex triangular cone 1 roughly convex triangular cone - _1 roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangle Cone substantially convex triangular cone substantially convex triangular cone substantially convex triangular cone substantially convex triangular cone substantially convex triangular cone substantially convex triangular cone substantially convex triangular cone 1 roughly convex triangle Example 18 Comparison Example 19 Example 20 Example 21 Example 22 Example 23 Comparative Example 8 Comparative Example 9 Example 24 Example 25 Example 26 Comparative Example 10 Comparative Example 11 -68- 148960.doc 201109741 Table 3 "#丨" shown in "The so-called "optical film arrangement ※" refers to a configuration of a light diffusion plate, a diffusion sheet, a diffusion sheet, and a brightness enhancement film. The above diffusion sheet is BS_912 (manufactured by Huihe Co., Ltd.). The brightness enhancement film described above is DBEF-D400 (manufactured by Sumitomo 3M Co., Ltd.). In Table 3, "※丨" shown in "Layer Configuration*" means a single layer 0 148960.doc •69· 201109741 *&lt; Inch backlight characteristic color unevenness Maximum color difference XXXXXXXXXX 〇0.0061 0.0059 0.0060 0.0059 0.0057 0.0055 0.0059 0.0058 0.0058 0.0052 0.0040 1 Brightness unevenness squint XXXXXXXXXX 〇0.0251 0.0198 0.0197 0.0211 0.0145 0.0114 0.0241 0.0182 0.0185 0.0055 ;0.0036 1 Positive XXXXXXXXX 〇◎ 0.0229 0.0177 0.0171 0.0158 0.0091 0.0103 0.0215 0.0179 0.0175 0.0047 0.0028 1 Brightness cd/cm2 1 5290 5320 5310 5330 5320 5320 5320 5330 5430 5010 4650 Optical film = tt % % % &lt; N % m = tfc BLU specification P / H 1.88 1.88 00 00 00 〇 0 -: 1.88 00 oo One: 00 oo 1.88 00 OO " OO 00 00 00 Two X mm VO v£&gt; VO ο CU mm 沄s The characteristic layer of the diffractive diffuser constitutes the iiiis S ii diffusivity (/&gt; (N &lt; N &lt; N CN CN (N (N (N (N (N & N) N Transmittance m Os mm Os 〇\ m OS m σ\ m Os m Os OS m On Reflectance o &lt;N &lt;N ΓΛ 00 m ON &lt;N 00 m Os CN m ΓΛ 〇\ m 〇\ &lt;J\ m Incident surface! P 〇〇o 〇o 〇o 〇oo 〇Outcut surface shape 00 ε . Face _ Ό ε =L oo O oo O o 〇〇〇OB a . , , _ _ — J3 ε a as 00 〇\ 00 ON 00 a\ 00 〇\ 00 〇\ 00 Os 00 Os 00 ON 00 Os 00 Os 00 &lt; 1.59 1.59 Os 1.59 1.59 1.59 1.59 1.59 o Os 1.59 s v -&gt; § ir&gt; convex-concave shape substantially concave triangular pyramid substantially concave triangular cone substantially concave triangular cone substantially convex four-corner cone substantially convex four-corner cone substantially convex four-corner cone substantially concave four-corner cone substantially concave four-corner cone substantially concave four-corner substantially concave four-corner cone Concave quadrilateral cone Comparative Example 12 Comparative Example 13 Comparative Example 14 Comparative Example 15 Comparative Example 16 Comparative Example 17 Comparative Example 18 Comparative Example 19 Comparative Example 20 Comparative Example 21 Comparative Example 22 -70-148960.doc 201109741 In Table 4, "optical" "#2" shown in the film arrangement ※" refers to the configuration of the light diffusion plate, the diffusion sheet, the diffusion sheet, the sheet, and the brightness enhancement film. "#3" shown in "The optical film arrangement ※" in Table 4 means a configuration of a light diffusion plate, a diffusion sheet, a diffusion sheet, a diffusion sheet, a prism sheet, and a brightness enhancement film. The above diffusion sheet was BS-9 12 (manufactured by Huihe Co., Ltd.). The above bracts are BEFIII (manufactured by Sumitomo 3M). The brightness enhancement film described above is DBEF-D400 (manufactured by Sumitomo 3M Co., Ltd.). In Table 4, "※1" as shown in "Layer Configuration*" means a single layer. 148960.doc 201109741 Backlight characteristics of God I ◎ ◎ ◎ ◎ 〇〇〇〇〇 ◎ ◎ ◎ ◎ 〇〇〇〇〇 0.0031 ι a ο ο 0.0033 0.0034 0.0041 0.0044 0.0046 0.0048 0.0049 0.0033 0.0031 f〇0032 0.0036 0. (8) 42 丨 0.0044 0.0045 0.0047 0.0048 Brightness unevenness squint ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 〇〇〇〇〇 0.0023 ι 0.0020 0.0023 0.0033 0.0038 0.0041 0.0043 0.0046 0.0048 0.0023 0.0021 10.0021 0.0033 0.0037 0.0040 0. (8) 45 0.0048 0.0049 Front ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 0.0020 ι 0.0017 s ο ο 0.0027 0.0031 0.0035 ο ο ο 0.0044 0.0046 0.0021 0.0018 10.0020 0.0029 0.0033 Ό.0034 0.0041 0.0045 0.0047 Brightness cd/cm2 5010 1 5330 5280 5310 5290 5290 5320 5320 5310 4980 5300 丨5310 5330 5310 '5320 5340 5330 5340 Optical film arrangement ※ % % % S =tt BLU size 5 CU 00 00 2 00 00 00 00 " 00 00 00 00 " 00 〇〇00 00 " 〇〇οο SS 00 〇0 00 00 00 00 “ 〇〇00 00 00 2 00 00 0 0 00 00 00 XS ε VO VO ο Ό \〇VO CU ε ε s Twilight diffuser characteristic layer composition iiiiiiiiiiiiiiiii diffusivity C/D ίΝ (Ν &lt;Ν (N (N (N (N (N (N (N (N (N (N (N (N (N (N CN (N c CS (N cs total light transmittance from m ΟΝ ΓΛ Os ΓΛ ON m ON CO 〇\ m ON ΓΛ Ο m ON S ON Os Os m 〇\ m OS m OS CO OS ma\ m Os Η Ό 00 VO 00 VO 00 ο 00 00 Ό 00 \ο 00 Ό 00 VO 00 v〇οο v〇00 SO 00 00 v〇00 VO 00 v〇00 S Reflectance c&lt; σ\ \ο 'Ο 3 ν妄 妄 00 VO ON Ό V*J m \ri ζ- etc. JO incident surface P ο ο Ο ο 〇ο Ο ο 〇Ο Ο ooo ο ooo Exit surface shaping shape | to ε η ο — — ο 〇ss Ο — factory, ooss 沄α ε α ο ο Ο ο 〇 ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο ο Γ- p- ο ο § 〇 00 s r- P oo &lt; ΟΝ os «ο ON tr&gt; Os Ό Os ΟΝ V*) ON «Τϊ 〇\ 〇\ OS «η 〇\ w-&gt; On »n ON OS OS OS φ ! 55.5 55.5 55.5 55.5 55.5 1 55.5 55.5 55.5 55.5 convex and concave shape roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone Convex triangular cone substantially convex triangular cone substantially convex triangular cone ι substantially convex triangular cone substantially convex triangular cone 1 substantially convex triangular cone substantially convex triangular cone substantially convex triangular cone substantially convex triangular cone embodiment 27 t embodiment 3 embodiment 28 ! 29 Example 30 Example 31 Example 32 Example 33 Example 34 1 Example 35j 1 Example 4 Example 36j Example 37 I Example 38 Example 39 Example 40 Example 41 Example 42 -72- 148960 .doc 201109741 In Table 5, "#lj" shown in "Optical Film Layout*" refers to a structure of a light diffusing plate, a spread sheet, a diffusion sheet, and a brightness improving film. The above-mentioned diffusion sheet is BS-9 12 (manufactured by Huihe Co., Ltd.). The brightness enhancement film described above is DBEF-D400 (manufactured by Sumitomo 3M Co., Ltd.). In the layer 0 in Table 5, the "※1" shown in the "layer composition" refers to the single - 148960.doc -73· 201109741 Backlight characteristic color unevenness Maximum color difference ◎ ◎ ◎ 〇Ο 〇〇〇 0.0033 0.0028 0.0032 0.0034 0.0039 0.0043 0.0045 0.0045 ! 0.0048 Brightness unevenness squint ◎ ◎ ◎ ◎ 〇〇〇〇· 〇0.0024 i _1 0.0020 0.0021 0.0024 〇〇0.0039 0.0044 丨0.0045 0.0047 Front ◎ ◎ ◎ ◎ ◎ ◎ 〇〇〇0.0019 0.0016 0.0020 ” 0.0023 0.0029 1 0.0033 0.0041 0.0042 0.0045 Brightness cd/cm2 5020 5330 5330 5320 5340 5350 5340 丨5350 5350 Optical film configuration ※ =tt ^t: :«: % % % 7 BLU specification P/H 1.88 00 00 21.88 00 oo 2 00 oo oo oo 1.88 1.88 two X mm v〇VO VO 〇- mm 沄sss light diffusing plate characteristic layer composition iiiiiiiii diffusivity 00 (N n N (N CM (N CM total light transmittance * m ON ro ON ΓΛ as m 〇\ ON\ m ON ma\ m Ο m 〇\ VO 00 00 o 00 v〇00 Ό 00 v〇OO Ό 00 s Reflectance 0^ o VO o fS 〇\ «η m un Incident face oo 〇 o O 〇ο 〇Outcut shape Shape ε =L o — oos 〇B a. ooooooo ο 〇£ a. o — v〇VO 宕宕_〇ε λ. σν 〇〇ss r- o ο &lt; mmmv〇 ΓΛ V〇mv〇VO s S &lt;x&gt; 5 convex and concave shape substantially convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly ±b triangular cone roughly convex triangular cone roughly convex triangular cone roughly &amp; triangle although 1 roughly convex triangle Cone substantially convex triangular cone embodiment 43 embodiment 12 embodiment 44 embodiment 45 embodiment 46 embodiment 47 embodiment 48 embodiment 49 embodiment 50 -74 - 148960.doc 201109741 "the so-called "optical film arrangement ※ "#1" shown in the figure refers to a configuration of a light diffusing plate/diffusion sheet/diffusion sheet/brightness improving film. The diffusion sheet was BS-912 (manufactured by Hohsen Co., Ltd.), and the brightness enhancement film was DBEF-D400 (manufactured by Sumitomo 3M Co., Ltd.). In Table 6, "※1" shown in "layer composition" means a single layer. 0 148960.doc -75- 201109741 Backlight characteristic color unevenness Maximum color difference 〇〇 ◎ ◎ ◎ 〇〇〇〇X 0.0045 0.0038 0.0030 0.0029 0.0029 0.0037 0.0044 0.0047 0.0049 j 0.0058 Luminance unevenness squint ◎ ◎ ◎ ◎ ◎ 〇〇〇 X 0.0048 0.0034 0.0020 0.0019 0.0020 0.0034 0.0047 0.0045 0.0048 1 0.0144 Front 〇 ◎ ◎ ◎ ◎ ◎ 〇〇〇 X 0.0047 0.0033 0.0016 0.0015 0.0015 0.0029 0.0045 0.0043 0.0045 0.0125 Brightness cd/cm2 5100 5280 5310 5430 5380 5360 5340 4880 4860 4620 Optical film distribution ※ 5 (Ν % 2 % BLU specification P/H 00 oo 1.88 00 00 2 00 00 — 1.88 s§ 1· 1.88 1.88 1.88 : 1.88 X mm &lt;〇\〇\〇VO CU mm ss Light diffusing plate characteristic layer composition iiiiiiiiii Diffusion rate C/3 fS Bub 00 (N v〇m Ό V*J (N total light transmittance Λ 3 ; σ! s; 00 m Os ΓΛ 〇\ m 〇s Η 冢m 00 ΓΟ 00 m 00 g JO 5; tn ON reflectance οί 00 VO VO W-ί v〇v〇un U&qu Ot;l |〇«Λ» (N incident surface D 〇ο ο ο ο 〇 oo Ο 〇 〇 射 赋 d E d. — 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一Λ一,. — , . o •D ε a. Ό\ 00 ο 00 σ\ 00 〇\ 00 〇\ 00 s ON 00 OS 00 σ\ 00 100 &lt; 1.59 1.59 1.59 1.59 1.59 5; On Os in Γ* -&gt;ν&gt; 1.49 Ο 5 5 5 «η «〇ιη •ο convex and concave shape roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone substantially convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex Triangular cone substantially convex triangular cone i substantially convex triangular cone embodiment 51 embodiment 52 embodiment 53 embodiment 54 embodiment 55 embodiment 56 embodiment 57 method embodiment 59 method comparison example 23 -76- 148960.doc 201109741 The term "light" refers to the configuration of the "#1_ι diffusion plate/diffusion sheet/diffusion sheet/brightness enhancement film" shown in 'Soy "Optical film arrangement*" in Table 7. In Table 7, the "#2" diffuser, the diffusion sheet, the cymbal, and the brightness enhancement film are shown in "Optical Film Layout*". In Table 7, "#3 j ' diffuser plate, lens sheet, lens sheet, and brightness enhancement film are shown in "Optical film arrangement ※". In Table 7, "layer structure" is shown in " *1", layer 0 The diffusion sheet is BS-912 (manufactured by Hohhot Co., Ltd.) The above sheet is BEFIII (manufactured by Sumitomo 3M Co., Ltd.) The lens sheet is PTR733 (manufactured by Shinwha Intertek Co., Ltd.). The brightness enhancement film described above is DBEF-D400 (manufactured by Sumitomo 3M Co., Ltd.). 148960.doc •77· 201109741 oo Backlight characteristic color unevenness Maximum color difference ◎ ◎ ◎ 0.0028 0.0029 0.0029 Brightness unevenness squint ◎ ◎ ◎ 0.0021 0.0022 0.0022 Front ◎ ◎ ◎ 0.0018 0.0019 0.0018 Brightness cd/cm2 5310 5300 5340 Optical film distribution ※ % BLU specification P/H 00 00 2 00 00 00 00 X mm o CU mm Diffusion plate characteristic layer composition &lt;N ※ rf ※ Diffusion rate 00 (N &lt; N (N total light transmittance m σ\ O CO ON Η V~) 00 s 00 Reflectance U, ss Incident plane D ooo Exit surface shaping shape ε — , — Ό ε =L ooo UB , ε =L 00 00 o 00 &lt; 1.59 1.59 1.59 Φ Concave and concave General shape convex triangular pyramid substantially convex triangular cone substantially convex triangular cone embodiment 60 Example 61 Example 62 148960.doc -78 201109741 In Table 8, the "#1 ^ diffusion plate" shown in "Optical film arrangement ※" The structure of the "diffusion sheet/diffusion sheet/brightness enhancement film" means the "※" and the diffusion plate shown in the "so-called "layer structure" of the two types of two layers in Table 8. In Table 8, " Layer composition "*3" refers to the configuration of the shaped film-free non-diffusion plate. The "※4" shown in the "layer composition" in Table 8 refers to the composition of the shaped non-diffusion plate + the shaped film. The above diffusion sheet is BS-912 (manufactured by Hohsen Co., Ltd.) The brightness enhancement film is DBEF-D400 (manufactured by Sumitomo 3M Co., Ltd.) 148960.doc 79-201109741

ON Backlight characteristic color unevenness Maximum color difference ◎ 〇◎ 〇0.0034 0.0046 0.0032 0.0046 Brightness unevenness squint ◎ 〇◎ 〇0.0032 0.0048 0.0031 0.0048 Front ◎ 〇◎ 〇0.0027 0.0043 0.0027 5 Ο 光学 Optical film distribution ※ BLU specification LED configuration configuration 1 Configuration 1 Configuration 1 Configuration 1 P/H 2.14 V-) CN 2.13 (Ν X mm (N ο CU mm 特性 Light diffuser characteristic layer constitutes iiii diffusivity C/0 (N &lt; N &lt; N (Ν total light transmission Rate j -Ο ΓΟ 〇\ 〇\ 〇\ Os Η v〇00 v〇oo 00 00 Reflectance οί \r&gt; v〇w〇to Ό Incident face o 〇o Ο Exit face shape ε λ — — — — *σ Ε nooo Ο ο ε α — — — — Ο ε ZL 00 ON 00 as 00 ΟΝ 00 C 1.59 1.59 C\ 1.59 &lt;χ&gt; 5 convex and concave shape roughly convex triangular cone roughly convex triangular cone roughly triangular cone Approximate convex triangular cone embodiment 63 Example 64 Example 65 Example 66 • 80-148960.doc 201109741 refers to the light finger list - r # i" shown in 'so-called "optical film arrangement ※" in Table 9, Diffuser / diffusion sheet / In the ninth embodiment, the r*1" shown in the "layer structure" is a layer. The diffusion sheet is BS-912 (manufactured by Hohsen Co., Ltd.). DBEF-D400 (manufactured by Sumitomo 3M Co., Ltd.) 148960.doc • 81 - 201109741 Backlight characteristic color unevenness maximum color difference ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 0.0033 0.0029 0.0029 0.0030 0.0031 0.0034 0.0033 0.0031 0.0030 0.0030 0.0032 0.0029 i - 0.0034 0.0032 不 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 32 32 32 32 32 32 32 32 32 32 0.0032 0.0026 0.0023 0.0028 0.0030 0.0034 0.0031 0.0029 0.0027 0.0028 0.0032 0.0030 0.0031 0.0031 ◎ 0.0022 0.0019 0.0019 0.0018 0.0019 0.0023 0.0021 0.0020 0.0019 0.0019 0.0022 0.0019 0.0022 0.0020 Brightness Γ1 cd/cm 5310 5300 5280 5300 5320 5330 5300 5320 5320 5320 5310 5300 5290 5300 1 Optical film distribution ※ % % % 5 % =«: % % % % % BLU specification LED configuration configuration 1 configuration 1 configuration 1 configuration 1 configuration 1 1 Configuration 1 Configuration 1 i Configuration 1 1 Configuration 1 Configuration 1 Configuration 1 Configuration I Configuration 1 P/H 1.76 (Ν CN rN 1.76 !S 1.76 m &lt;N ΡΛ &lt;Ν &lt;N JO (Ν JO ν〇X mm Ό »n U-ϊ r-· 00 Bu Bu «Λ> oo 2 1 mmi 1 ο m Light diffuser characteristics α/β/γ | 60/60/60 60/60/60 60/60/60 60/ 60/60 60/60/60 60/60/60 60/60/60 60/60/60 60/60/60 60/60/60 60/60/60 58/60/62 155/60/65 56/ 68/56 Uh CN ο cs v-&gt; wj IT) CN 00 &lt;N s (N m ΡΟ ο ο o Diffusion rate C/3 (Ν (Ν &N; N CN (Ν CM ΓΜ CN (Ν (N Ν N CM ΓΊ (N total light transmittance ο ο ΓΛ ON m σ\ m 〇ON 〇\ Ό\ OS ΓΛ os ΓΛ OS σΝ m ON m OS m ON Η 00 00 Ό 00 v〇00 Ό 00 00 \〇00 v〇 00 Ό 00 00 VO 00 00 Ό 00 00 Reflectance cC *n \o yn \〇UJ \D v〇V) Ό \ο so SO Ό VO \〇3 5; Incident surface D ooo 〇oo ο o Ο 〇ο o ο o Exit surface shaping shape bX) ε α T3 Β η ooo 〇oo ο o Ο o ο o ο O o ε λ. — one — — — — Μ — — one X) ε On 〇0 〇\ 00 OS Oo OS 00 OS 00 ON 00 〇\ 00 ON 00 00 On 00 ΟΝ 00 00 σ\ 00 On 00 &lt; 1.59 Os 〇\ V) O\ ON 〇\ Ον 0's ΟΝ Ό On ΟΝ σ\ 1.59 〇\ &lt;x&gt; 5 5 卜卜Γ ιο convex and concave shape 1 roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone roughly convex triangular cone Convex triangular cone substantially convex triangular cone substantially convex triangular cone substantially convex triangular cone embodiment 67 embodiment 68 embodiment 69 embodiment 70 embodiment 71 embodiment 73 embodiment 74 embodiment 74 embodiment 76 78 Example 79 Example 80 · 82· 148960.doc 201109741 "# l" shown in 'The so-called "optical film arrangement ※" in Table 10 refers to a light diffusing plate/diffusion sheet/diffusion sheet/brightness improving film. The composition. The above diffusion sheet is BS-912 (manufactured by Hohsen Co., Ltd.). The brightness enhancement film described above is DBEF-D400 (manufactured by Sumitomo 3M Co., Ltd.). In the table, "Arrangement 1" of the "led configuration" refers to a sawtooth arrangement of 32.2 mm (see Figs. 16 to 18).曰1巨148960.doc 83· 201109741 【II ί Backlight characteristic color unevenness maximum color difference ◎ ◎ 〇0.0029 0.0033 0.0041 Brightness unevenness squint ◎ ◎ ◎ 0.0023 0.0023 0.0025 Front ◎ ◎ ◎ 0.0019 1 J0.0018 0.0021 Brightness cd/cm2 5280 5190 4860 Optical film arrangement ※ BLU specification LED configuration 1 1 Configuration 1 Configuration 1 LED type LED-1 LED-2 LED-3 P/H fS cn fN X mm ν〇ν-ϊ Cu mm S Light diffusion plate characteristic diffusion Rate C/D &lt;Ν &lt;N (N total light transmittance Λ ΓΛ 〇\ m 〇\ m Os Η ν〇00 vo 00 00 reflectance cd Ό incident surface D Ο 〇o exit surface shaping shape ε — — T3 ε Ο ooo Β ZL — — X) ε η. Os 00 ON 00 〇\ 00 &lt; 1.59 〇\ «〇1.59 1 卜*Ti 卜m 卜v> The convex and concave shape is roughly convex, the triangular cone is roughly convex, the triangular cone is roughly convex Triangle cone embodiment 81 Example 82 Example 83 148960.doc -84 201109741 In Table 11, "#1" shown in "Optical film arrangement*" means a light diffusing plate/diffusion sheet/diffusion sheet/ Brightness enhances the composition of the film. The above diffusion sheet is BS-912 (manufactured by Hohsen Co., Ltd.). The brightness enhancement film described above is DBEF-D400 (manufactured by Sumitomo 3M Co., Ltd.). The "configuration of the so-called "LED configuration" in Table 11 refers to the configuration of the ore teeth with an LED pitch of 32.2 mm (refer to Figure μ~Fig. 8). This application is based on the patent issued on September 11, 2009. The application for this patent application (Sakamoto's special request 2009.211115), and the patent application filed by the Japanese Patent Office on September 11, 2009 (Sakamoto's special request 2009-211117) Industrial Applicability The light diffusing plate of the present invention has a strong light intensity with a light source, in particular, a straight light having a light peak angle of -25 to 25 degrees. The backlight of the light source has industrial availability. The point source backlight provided with the light diffusing plate of the present invention can achieve significantly superior brightness and brightness uniformity under the desired backlight thickness using less optical film. (front and squint) and color unevenness characteristics, so it is useful, for example, for a wide range of applications such as LED light source LCD TVs, LED light source billboards, and LED light source illumination. [Simplified Schematic] Figure 1 shows the shape of the light diffusing plate. Convex triangular pyramid shape Fig. 2 is a perspective view showing an example of a convex triangular pyramid shape in which the apex of the surface of the light diffusing plate is curved. 148960.doc •85· 201109741 Fig. 3 is a view of the surface of the light diffusing plate Fig. 4 is a perspective view showing a shape of a convex triangular frustum shape as defined in the claim 1 of the present invention, and a tilt angle Θ of a convex triangular pyramid shape as described in the claim 1 of the present invention and forming a convex triangular pyramid shape t Μ舳Figure 5 is a diagram showing the ugly appearance of the surface of the light diffusing plate. The front view and the cross-sectional view of the convex triangular pyramid shape of the thief-shaped figure are shown in Fig. 6. Figure 7 is a diagram showing the inner corner of the triangular shape of the convex triangular shape of the surface of the light diffusing plate. Figure 7 is a layered structure of the light diffusing plate (due to «layer, continuous layer, separation layer) Fig. 8 is a longitudinal sectional view showing an example of a point source backlight device of the present embodiment. Fig. 9 is a light distribution diagram of LED-1.

Triangle cone shape with LED triangle cone shape and LED

Pyramid shape and LED Figure 10 is a correlation diagram of the convex portion configuration of the surface of the light diffusing plate. Fig. 11 is a correlation diagram showing the arrangement of the convex portions formed on the surface of the light diffusing plate. Fig. 12 is a correlation diagram of the arrangement of the convex portions formed on the surface of the light diffusing plate. Figure 7 is a diagram showing the LED configuration of the backlight (grid map). Fig. 14 is a diagram showing the LED configuration (sawtooth configuration) of the backlight. The convex triangular pyramid shape formed on the surface of the diffuser plate, 148960.doc • 86 - 201109741 Correlation diagram of the configuration.

Convex-corner shape and LED

Convex pyramid shape and LED Figure 16 is a correlation diagram of the configuration of the surface of the light diffusing plate. Fig. 17 is a correlation diagram of the configuration of the shape of the surface of the light diffusing plate.

The shape of the pyramid and the LED Figure 18 shows the relationship between the three configurations of the convex portion on the surface of the light diffusing plate. Figure 19 is a light distribution diagram of LED-2. Figure 20 is a light distribution diagram of LED-3. Front view of the light-emitting surface side of the example Fig. 21 is a view (a convex triangular pyramid shape) of the light-diffusing sheet of the present embodiment. Fig. 22 is an explanatory view showing a method of measuring luminance unevenness in the embodiment. Fig. 23(A) is a top view of a convex portion for explaining the definition of g. Fig. 23(b) is a partial cross-sectional view showing a convex portion for explaining the definition of g. Fig. 24 is a perspective view showing an example of a convex triangular pyramid shape in which the apex and the ridge line of the surface of the light diffusing plate are curved. [Description of main component symbols] B The portion C satisfying (1') and (2,) in the cross section of the convex portion is the portion D on the bottom side of the convex portion in the cross section of the convex portion, and the top portion of the convex portion is more top than the C portion. The part of the side of the F-shaped light diffusing plate is shaped by the convex portion 2, one side of the triangular shape of the pyramid shape, and the angle formed by the diagonal of the square of the square forming the lattice of the point source. The LED spacing of the LED sawtooth configuration is 148960.doc -87 · 201109741 n2 LED pitch of LED ore configuration α The inner corner of the triangle of the triangular pyramid shape shaped on the surface of the light diffusing plate β The triangular triangle of the convex triangular shape of the surface of the light diffusing plate Inner angle γ The internal angle of the underside triangle of the convex triangular pyramid shape shaped on the surface of the light diffusing plate 148960.doc •88-

Claims (1)

201109741 VII. Patent application scope: 1. A light diffusing plate for a point light source, which is a light diffusing plate having a plurality of convex portions formed on a surface thereof, wherein the convex portion has a triangular triangular shape and a substantially triangular pyramid shape. The inclination angle θ of the side surface with respect to the bottom surface and the refractive index 材料 of the material forming the convex portion satisfy the following formulas (1) and (2): (1) . . . -40A° + 115.2° (2) · · 25A0+22.25, 2. The light diffusing plate for a point source according to claim 1, wherein the inclination angle θ and the refractive index Α satisfy the following formulas (3) and (4): (3) · · · -40Αο + 116.2 ο (4) · · · 25Αο + 20.25ο. 3. A light diffusing plate for a point source according to claim 1 or 2, wherein said tilt angle 0 is θ#55°. 4. The light-diffusing sheet for a point light source according to any one of claims 1 to 3, which does not exhibit a return reflection characteristic with respect to visible light incident from a side opposite to a surface side of the convex portion forming surface, and further satisfies the following Condition (1), Condition (1): When a light having a wavelength of 450 to 750 nm is incident on the opposite side of the convex portion from an incident angle inclined by 7 degrees with respect to a perpendicular to the horizontal plane of the light diffusion plate, using a spectrophotometer The average reflectance r is 45% or more. 5. The light diffusing plate for a point light source according to any one of claims 1 to 4, which satisfies the following formula (5): (5) * · . g/(b+c+d)^ 0.30 148960.doc 201109741 (In the formula (5), b, c, and d respectively represent the point, the j point, and the apex of the convex portion (the center of gravity of the top triangle when the convex portion is in the shape of a triangular frustum) at 3 o'clock. In the cut surface which is formed when the convex portion is cut by the plane, the angle formed by the tangent plane of one side surface of the convex portion and the bottom surface satisfies the projection of the portion b of the following formulas (1) and (2') to the horizontal plane. The length of the line segment, the length of the projection line segment that projects the portion c located on the bottom side of the B more convex portion to the horizontal plane, and the length of the projection line segment that projects the portion D located on the more top side of the B to the horizontal plane, (1丨) · · · θ'^ -40Αο+115.2° (2')· . · θ'^ 25A° + 22.25° I point: the apex of the convex part (the top triangle when the convex part is in the shape of a triangular frustum The center of gravity is the point of vertical projection to the bottom triangle, J point. From the above point I, the distance from the above work point in the side of the bottom triangle In the equation (5), g is expressed on the plane perpendicular to the bottom triangle and is cut by the following 1' point, J, and the plane of the point. In the one-side portion of the cut surface that is present at the center to the J| point, the angle between the tangent to one side of the convex portion is greater than the angle between the tangent and the bottom surface, satisfying (丨,) and ( The portion of the top portion of the crucible is projected to the length of the projection line segment of the horizontal plane, wherein, in the case where there are a plurality of cut surfaces satisfying the above conditions, the cut surface having the largest value of g is used, I, point: The apex of the convex portion (in the case where the convex portion is in the shape of a triangular frustum, the center of gravity of the top quadrilateral is 148960.doc 201109741), the point vertically projected to the bottom triangle, and the bottom surface - the bottom triangle of the apex of the angle closest to the projection point The point in the line segment connecting the vertices, J point. From the above r point, the intersection of the vertical line and the side when the vertical line is drawn from the side closest to the I point in the side of the bottom triangle is formed.) Mingzhi item 5 The light diffusing plate for a point light source, wherein the sum of b, ^ and d is 5 to 200. 7. The light diffusing plate for a point light source according to any one of the items 1 to 6, comprising at least 0) a lens layer and (b) a diffusion layer, wherein the (a) lens layer and the (1)) diffusion layer are selected from the group consisting of a same layer, a continuous layer, and a separation layer, wherein the convex portion is formed in the above (a) The surface of the lens layer. 8. The light diffusing plate for a point light source of claim 7, wherein the (b) diffusion layer contains a transparent resin and a diffusing agent, and the diffusivity S is 2 to 40 Å/〇. 9. The light diffusing plate for a point source according to claim 7 or 8, comprising (a) a lens layer and (b) a diffusion layer, wherein a sum of thicknesses of said (a) lens layer and (b) diffusion layer is 〇5 ~3 〇mm. 10. A direct-type point source backlight device, comprising: a plurality of point light sources; the light diffusing plate according to any one of claims 1 to 9, which is disposed above the point light source, and at the point a surface of the light source opposite to the side opposite to the surface side, and a plurality of convex portions having a substantially triangular pyramid shape with a bottom surface formed thereon; and 148960.doc 201109741 11. 12 13 14 15 16. Diffusion reflective sheet It is disposed below the point light source. The direct-type point light source backlight device of claim 10, wherein the point light source has a light peak angle of -25 to 25. LED light source. For example, if the direct-type point source backlight device of claim 1 or 1 is used, the diffuse reflectance of the diffuse reflection sheet on Danjia is 9〇% or more. The direct type backlight device according to any one of claims 10 to 12, wherein the light-emitting surface side of the light-diffusing sheet further comprises at least two optical films having a light-concentrating function. The direct type backlight device according to any one of claims 10 to 13, wherein when the average pitch of the point light sources is set to p, and the distance from the point source to the light diffusing plate is set to Η, P/Η It is in the range of 1.5 to 2.5. A direct type backlight device comprising a plurality of point light sources and a light diffusing plate according to any one of claims 1 to 9, wherein the plurality of point light sources are periodically arranged in a lattice shape, and the plurality of light diffusing plates are plural The convex portions are periodically arranged such that one side of the bottom surface of the adjacent convex portions is parallel to each other, and the plurality of point light sources and the light diffusing plate are triangularly arranged on the bottom surface of each convex portion of the light diffusing plate Either side is laminated in parallel or perpendicular to the diagonal of the square of the lattice constituting the lattice arrangement of the point light source. A direct type backlight device comprising a plurality of point light sources and a light diffusing plate of any one of the items 1 to 9 of the above-mentioned items 1 to 9, wherein the plurality of point light sources are periodically arranged in a lattice shape, The bottom surface of the plurality of convex portions is a substantially triangular pyramid shape of an isosceles triangle, and the plurality of convex portions of the light diffusion plate are periodically arranged such that the bottom sides of the isosceles triangles of the bottom surfaces of the adjacent convex portions are parallel to each other. And the plurality of point light sources and the light diffusing plate are parallel or perpendicular to a bottom line of an isosceles triangle of a bottom surface of each convex portion of the light diffusing plate and a diagonal line of a square of a lattice arranged in a lattice shape of the point light source. The way it is layered. A direct type backlight device comprising a plurality of point light sources and a light diffusing plate according to any one of claims 1 to 9, wherein the plurality of point light sources are periodically arranged in a lattice shape, and the surface is an equilateral triangle The plurality of convex portions are periodically arranged in a substantially triangular shape, and the WW &lt;low relief quadrilaterals are arranged in a manner parallel to each other, and the plurality of point light sources and the light 'κ scattering plate are One side of the right triangle of each convex portion of the light diffusing plate is laminated in parallel or perpendicular to the diagonal of the square forming the lattice of the point light source. Fly 148960.doc